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Grapheneis emerging as a broadband optical material which canbe dynamically tuned by electrostatic doping. However, the directapplication of graphene sheets in optoelectronic devices is challengingdue to graphene’s small thickness and the resultant weak interactionwith light. By combining metal and graphene in a hybrid plasmonicstructure, it is possible to enhance graphene–light interactionand thus achieve in situ control of the optical response. We showthat the effective mode index of the bonding plasmonic mode in metal–insulator–metal(MIM) waveguides is particularly sensitive to the change in the opticalconductivity of a graphene layer in the gap. By incorporating suchMIM structures in optic antenna designs, we demonstrate an electricallytunable coupled antenna array on graphene with a large tuning range(1100 nm, i.e., 250 cm–1, nearly 20% of the resonancefrequency) of the antenna resonance wavelength at the mid-infrared(MIR) region. Our device exhibits a 3 dB cutoff frequency of 30 MHz,which can be further increased into the gigahertz range. This studyconfirms that hybrid metal–graphene structures are promisingelements for high-speed electrically controllable optical and optoelectronicdevices. [ABSTRACT FROM AUTHOR]

In recent decades, electrochemical detection of arsenic(III) has been undergoing revolutionary developments with higher sensitivity and lower detection limit. Despite great success, electrochemical detection of As(III) still depends heavily on noble metals (predominantly Au) in a strong acid condition, thus increasing the cost and hampering the widespread application. Here, we report a disposable platform completely free from noble metals for electrochemical detection of As(III) in drinking water under nearly neutral condition by square wave anodic stripping voltammetry. By combining the high adsorptivity of Fe3O4 microspheres toward As(III) and the advantages of room temperature ionic liquid (RTIL), the Fe3O4-RTIL composite modified screen-printed carbon electrode (SPCE) showed even better electrochemical performance than commonly used noble metals. Several ionic liquids with different viscosities and surface tensions were found to have a different effect on the voltammetric behavior toward As(III). Under the optimized conditions, the Fe3O4-RTIL composites offered direct detection of As(III) within the desirable range (10 ppb) in drinking water as specified by the World Health Organization (WHO), with a detection limit (3σ method) of 8 × 10-4 ppb. The obtained sensitivity was 4.91 μA ppb-1, which is the highest as far as we know. In addition, a possible mechanism for As(III) preconcentration based on adsorption has been proposed and supported by designed experiments. Finally, this platform was successfully applied to analyzing a real sample collected from Inner Mongolia, China. [ABSTRACT FROM AUTHOR]

Two isomorphous three-dimensional metal−organic frameworks, [M(dtb)(4,4′-bipyridine)1.5(H2O)]n (1, M = Ni; 2, M = Co) [dtb = 5,5′-dithiobis(2-nitrobenzoic acid), 4,4′-bipy = 4,4′-bipyridine], have been synthesized by ligating metal ions with V-shaped H2dtb and linear 4,4′-bipy ligands, and they have been characterized structurally by single crystal X-ray diffraction studies and FT-IR and TGA analysis. Complexes 1 and 2 exhibit fascinating interweaved meso-helices and represent the first examples of metal−organic frameworks with four spiral shafts in one helical chain, named a tetraflexural helix. The pitch of the single helical chain is up to 27.741 Å, which is out of the normal scope of helical pitch. Two isomorphous MOFs [M(dtb)(4'4-bipy)1.5(H2O)]n (M = Ni/Co) exhibit fascinating interweaved meso-helices, containing four spiral shafts in a single helix, which is named a tetraflexural helix. Viewing along the ab plane, the helical chain twists like a four-leaf clover which shares a and c shafts with the right helical chain and co-uses the b and d shafts with the left helical chain. [ABSTRACT FROM AUTHOR]

A novel one-dimensional (1D) metal−organic nanotube {[Cd2(ADC)2(bpp)3(H2O)]2·8H2O}n(MONT-1), based on mixed organic ligands, has been synthesized and characterized. MONT-1presents the first independent 1D metal−organic nanotube with mesohelical structure and a fascinating topology of 1D → 2D interdigital architecture with side arms. This compound also exhibits high thermal stability and blue-shift emission with large intensity enhancement compared with that of the free ligand and can be explored for potential blue luminescent materials. [ABSTRACT FROM AUTHOR]

The photochemical [2 + 2] cycloaddition reaction in crystalline materials is one of most important routes for the synthesis of cyclobutane compounds, which are otherwise difficult to prepare by conventional organic synthesis. In this perspective, a series of olefins that undergo photochemical [2 + 2] cycloaddition reactions is summarized and categorized according to their various functionality. Using these olefins, a range of cyclobutane derivatives were prepared by this [2 + 2] cycloaddition protocol. [ABSTRACT FROM AUTHOR]

A simple and efficient protocol for the fluoroacetylation of indoles is reported. The reaction uses fluorinated acetic acids as the fluoroacetylation reagents to synthesize diverse fluoromethyl indol-3-yl ketones in good yields under catalyst- and additive-free conditions. In addition, the only byproduct is water in this transformation. The synthetic utility of this reaction was also demonstrated by the concise synthesis of α-(trifluoromethyl)(indol-3-yl)methanol and indole-3-carboxylic acid. [ABSTRACT FROM AUTHOR]

We show here the supramolecular isomerism, with respect to shape-asymmetry of ligand and the new hierarchical classification for supramolecular isomerism, the three-level isomerism, which was advanced based on a thorough investigation for the four new Ni/dpt24 polymorphs [Hdpt24 = 3-(2-pyridyl)-5-(4-pyridyl)-1,2,4-triazole)]. Compounds 1, 2, and 3 are three-dimensional twofold interpenetrated porous coordination polymers with NbO topology, while 4 with two-dimensional grid structure is termed as the primary isomer of 1/2/3 due to the difference of dimensionality. Complex 3 possessing different shape-asymmetry of single networks from 1 and 2, is called as the secondary isomer of 1 and 2. Complexes 1 and 2 possess the same topology, single shape-asymmetry networks, but different interpenetration-orientation and interpenetration-asymmetry, and are defined as the tertiary isomers. Distinct differences in H2 and CO2 adsorption capacity were observed among each level of isomers. In addition, the hierarchical classification's relationship with characteristic classifications has been discussed. [ABSTRACT FROM AUTHOR]

A Pd(II)-catalyzed C-H monocarbonylation of N-alkylanilines for the synthesis of o-aminobenzoates has been developed. Various aliphatic alcohols and phenol were tolerated in the reaction to afford the corresponding o-aminobenzoates in good yields under mild balloon pressure of CO. [ABSTRACT FROM AUTHOR]

A p-TsOH-mediated 1,3-dipolar cycloaddition ofnitroolefins and sodium azide for the synthesis of 4-aryl-NH-1,2,3-triazoles has been developed. p-TsOH was discovered as a vital additive in this type of 1,3-dipolarcycloaddition. This novel cycloaddition reaction is a good methodfor the rapid synthesis of valuable 4-aryl-NH-1,2,3-triazolesin high yields. [ABSTRACT FROM AUTHOR]

A noveland efficient palladium-catalyzed intramolecular oxidativecyclization of tertiary enamines for the synthesis of 1,3,4-trisubstitutedpyrroles and 1,3-disubstituted indoles has been developed. Trifluoroaceticacid plays an important role in the reaction. A series of pyrrolesand indoles with substitution patterns that are not easily accessibleby traditional routes were synthesized in good yields under mild conditions. [ABSTRACT FROM AUTHOR]

A noveland efficient palladium(II)-catalyzed alkenyl C–Hactivation oxidative annulation of enamides with alkynes for the synthesisof substituted pyrroles has been developed. The reaction toleratesa wide range of functional groups and is a reliable method for thesynthesis of triaryl-substituted pyrroles in high yields. [ABSTRACT FROM AUTHOR]

A novel Cu(TFA)2-catalyzed oxidative tandem cyclization/1,2-alkyl migration of readily available enamino amides for the synthesis of pyrrolin-4-ones has been developed. The reaction tolerates a wide range of functional groups and is a reliable method for the rapid synthesis of substituted pyrrolin-4-ones in high yields under mild conditions. [ABSTRACT FROM AUTHOR]

Five novel Zn(II)/Cd(II)-based coordination polymers 1–5with a flexible disulfide derivative of the nicotinate 6,6′-dithiodinicotinic acid (H2cpds) and two rodlike N,N′-donor ligands (bpa =1,2-bi(4-pyridyl)ethane; bpp = 1,3-bis(4-pyridyl)propane) have been successfully synthesized under the liquid diffusion condition and characterized by elemental analysis, IR spectra, and X-ray diffraction, namely {[Zn(cpds)]·H2O}n(1), {[Zn(cpds)(bpa)0.5]}n(2), {[Zn(cpds)(bpp)]}n(3), {[Cd(cpds)(bpa)1.5]·H2O}n(4), and {[Cd2(cpds)2(bpp)·(H2O)3]·4H2O}n(5). Complexes 1–5display various coordination motifs due to different conformations, and coordination modes of the H2cpds ligand, at the same time the effect of the auxiliary ligands plays important roles in the construction of extended supramolecular networks. Complexes 2–4all exhibit 2D layer structures, in which 2displays a 2-fold 2D → 2D parallel interpenetration framework containing a rotaxane-like motif and 3is a 2D 44gridlike layer. Compound 4contains two kinds of 2D chiral layers composed of three types of single-helical chains and two types of double-stranded helices. Two high-dimensional complexes (3D) with a microporous network containing a 1D metal–organic nanotube filled with plenty of free water molecules for 1, and a 3-fold interpenetrating network with (46·64) topology by considering the cadmium dimer unit as a five-connected node for 5, are observed. Solid-state properties of thermal stability, X-ray powder diffractions, and the photoluminescence properties at room temperature for these crystalline materials have been investigated. [ABSTRACT FROM AUTHOR]

Two unprecedented three-dimensional (3D) true coordination polymorphs, namely, [Pb2(phda)2(H2O)]n·2nH2O (1a, and 1b) (H2phda = 1,4-phenylenediacetate acid), which show distinct novel topological networks, have been successfully prepared by utilizing a kinked flexible H2phda. This work shows the first example of two different isomers reported for a flexible ligand acting as a bridge. Two unprecedented three-dimensional (3D) PbII coordination polymorphs, namely, [Pb2(phda)2(H2O)]n·2nH2O (1a, and 1b) (H2phda = 1,4-phenylenediacetate acid), which show distinct novel topological networks, have been successfully prepared by utilizing a kinked flexible H2phda. This work shows the first example of two different isomers reported for a flexible ligand acting as a bridge. [ABSTRACT FROM AUTHOR]

Under different situations, solvothermal reactions of 3,5-diethyl-4-(4-pyridyl)-pyrazole (HL) with CuX or CuX2 (X = Cl, Br, I, and SCN) afforded five copper(I) coordination polymers, {CuX[CuL]3∙solvent}n (X = Cl, 1; Br, 2; I, 3; X = SCN and solvent = MeCN, 4) and {Cu2I2[CuL]3}n (5). X-ray diffraction analyses show that all the complexes have trinuclear [CuL]3 (referred as Cu3) secondary building units featuring planar nine-membered Cu3N6 metallocycles with three peripheral pyridyl groups as connectors, which are further linked by CuX or Cu2X2 motifs to generate single- or double-strand chains. Interestingly, the Cu(I) atoms within the Cu3 units in 1–5 behave as coordinatively unsaturated π-acid centers to contact soft halide/pseudohalide X atoms of CuX and Cu2X2 motifs, which lead to novel sandwich substructures of [(Cu3)(Cu2X2)(Cu3)] (X = Br, I, and SCN) in 2—4. In addition, both the π-acid [Cu3]⋯X contacts and intertrimer Cu⋯Cu interactions contribute to the one-dimensional (1D) double-strand and 2D/3D supramolecular structures of 1⋯5. All of these complexes exhibit high thermostability and bright solid-state phosphorescence upon exposure to UV radiation at room temperature. The emissions arise from the mixtures of metal-centered charge transfer, metal to ligand charge transfer, and halide-to-ligand charge transfer excited states, and can be tuned by intermolecular π-acid [Cu3]⋯halide/pseudohalide contacts. [ABSTRACT FROM AUTHOR]

A fascinating 3D entangled metal-organic framework, namely, {[Co2(bcp)2]• 3H2O}n (1), was obtained through the solvothermal generation of flexible and long dicarboxylate (bcp) and metal salt. The crystal structure contains a 1D metal chain with bcp ligands wrapped around it in a wavy line and features an unusual entangled topologicol net. Furthermore, the magnetic behavior of 1 was also studied and indicated the existence of ferromagnetic interaction and long-range ordering character. [ABSTRACT FROM AUTHOR]

Through middle-temperature solvothermal reactions of CoCl2·6H2O with the rigid-angled ligand 3-(2′-pyridyl)-5-(4″'-pyridyl)-1,2,4-triazole (Hdpt24), we obtained the three cobalt complexes {[Co(dpt24)2)]3·4DMF·1.5H2O}n (1), {[Co(dpt24)2)]2·H2O}n (2), and Co(dpt24)2(Hdpt24)·H2O] (4) at N,N-dimethylformamide (DMF)/H2O volume ratios of 9:1, 1:1, and 0:1, respectively. Interestingly, 1 underwent transformations into 2, {[Co(dpt24)2]·0.5DMF}n (3), and 4 when treated with DMF/H2O at volume ratios of 1:1, 1:9, and 0:1, respectively. Moreover, 3 and 4 converted back to 1 in 9:1 DMF/H2O and to 2 in 1:1 DMF/H2O; 3 transformed into 4 in H2O and vice versa in 1:9 DMF/H2O. Structurally, 1 is a three-dimensional (3D) 2-fold interpenetrating distorted NbO-type complex, 2 possesses a two-dimensional layer metal-organic framework, 3 is a 3D 2-fold interpenetrating typical NbO-type complex, and 4 is a wheel-shaped mononuclear neutral complex. This approach, using a mixed solvent's component ratio to direct the syntheses and conversions of four cobalt complexes, provides unprecedented control for crystal engineering. [ABSTRACT FROM AUTHOR]

Five novel coordination polymers containing N-[(3-carboxyphenyl)-sulfonyl]glycine (H 3L), namely [Co 3L 2(μ 2-bipy) 2(H 2O) 6] n·2 nCH 3OH·8 nH 2O ( 1), [Mn(HL)(μ 2-bipy)(H 2O) 2] n· nH 2O ( 2), [Mn(HL)(μ 2-bipy)(H 2O)] n·3 nH 2O ( 3), [Mn(HL)(bipy)(μ 2-bipy) 0.5(H 2O)] n·4 nH 2O ( 4), [Ca(H 2O) 4Cu 2(μ 2-bipy) 2L 2] n·4 nH 2O ( 5) (bipy = 4,4′-bipyridine), were prepared under control by tuning the reaction conditions such as pH value, reaction temperature, and starting materials. X-ray structural analyses of 1– 5reveal their structural diversity ranging from one-dimensional (1D) ( 1), two-dimensional (2D) ( 2), and noninterpenetrating 3-D porous coordination polymers ( 3, 4) to a 2-fold 3D interpenetrating network ( 5). Compound 1presents a 1D chain structure with alternating [CoL(H 2O)] 22−binuclear and [Co(4,4′-bipy) 2(H 2O) 4] 2+mononuclear units along the a-axis. Polymer 2, which was formed at a comparatively lower temperature, has a 2D structure extended by a HL 2−ligand and a monopillar of bipy. A higher temperature was used in the preparation of 3and 4. In addition, 3was synthesized also at a higher pH value. In 3, HL 2−ligands link the metal ions to form 2D wavelike rectangle-grid layers which are held together through μ 2-bipy molecules in a double-pillar supporting fashion to give a 3D porous framework. A decrease of the pH value led to the formation of another 3D porous framework 4, in which each Mn center binds two trans-located bipy molecules. One bipy behaves as a terminal ligand, while the other one acts as a bridging ligand extending the 2D layers into a unique 3D porous framework. When calcium hydroxide was used, it led to the construction of a 2-fold 3D interpenetrating network of 5where the Cu atoms are joined by bipy ligands to generate a 1D zigzag chain. The thermogravimetric (TG) and powder X-ray diffraction (PXRD) measurements reveal that both 3and 4are stable after dehydration. All of these suggest that the ligand of H 3L is a versatile building block for the construction of metal organic frameworks (MOFs). [ABSTRACT FROM AUTHOR]

A novel flexible ligand dpap·2H2O (1) (dpap 2,6-(N,N‘-di(4-pyridyl)amino)pyridine) and its five related coordination polymers Cu(dpap)(OAc)2·CH3CNn(2·CH3CN), Cu(dpap)(OAc)2·0.25CH2Cl2n(2·0.25CH2Cl2), Cu(dpap)(OAc)2·CHCl3n(2·CHCl3), Cu(dpap)(OAc)2·0.5CH3OHn(2·0.5CH3OH), and Cu(dpap)(maa)2·2CH3OHn(3·2CH3OH) (Hmaa 2-methyl-acrylic acid) have been synthesized and structurally characterized by X-ray crystallography. The networks showed a lack of dependence on the nature of the counterion and solvent. Compound 2·CH3CNconsists of uncoordinated guest CH3CN molecules and a one-dimensional (1D) zigzag chain. The diffusion in the CH2Cl2solvent system results in a 1D helical chain of 2·0.25CH2Cl2, and that in CHCl3system leads to a meso-helix chain Cu(dpap)(OAc)2motif of 2·CHCl3. The overall structure of 2·0.5CH3OHwas found to be similar to that of 2·0.25CH2Cl2despite the presence of different solvent molecules. The volumes of the channels are as follows:  2·CHCl3>2·0.25CH2Cl2> 2·CH3CN> 2·0.5CH3OH. Using an maa group instead of an OAc-anion, we obtained polymer 3·2CH3OH, which displays a topological meso-helix chain. [ABSTRACT FROM AUTHOR]

A new metal-organic framework (MOF), [Co3(tzba)2(bpy)3(F)2]·DMF·C2H5OH·2H2O (1), has been constructed by solvothermal reaction of Co(NO3)2 with 4-(1H-Tetrazol-5-yl) benzoic acid (H2tzba) and 4,4'-bipyridine (bpy) mixed ligands. 1 shows an interpenetrated three-dimensional (3D) pillar-layered framework with the novel trinuclear [Co3(CN4)2(F2)] clusters. The π···π interactions existing among three bpy give rise to an uncommon tripillar in the framework. The framework reveals a reversible dynamic flexibility related to the solvent molecules. Meanwhile, the adsorption of CO2 exhibits an interesting gate opening-closing phenomenon which features the S-shaped isotherms with dramatic hysteretic desorption. The selective adsorption of CO2 over CH4 as well as the adsorption mechanism for CO2 were also discussed deeply. [ABSTRACT FROM AUTHOR]

An achiral 2,2'-bipyridyl-3,3'-dicarboxylate (H2LN) can be oxidized to a C2 axially chiral N-oxide analogy (R,S)-2,2'-bipyridyl-3,3'-dicarboxylate-1,1'-dioxide ((R,S)-H2LNO), converting normal bipyridyl-N to a charge-separated N-oxide group. The achiral H2LN connects the Ag(I) ions into a 4-connected mesomeric 3D network [Ag4(LN)2·(H2O)]·3H2O (1). However, as expected, with the introduction of N-oxide groups, {Ag4[(R,S)-LNO]2·2(H2O)}·H2O (2) and {Ag2[(R,S)-LNO]}·H2O (3) contain right- and left-handedness homochiral layers. Such opposite handedness layers are linked together to give a racemic compound in 2 but meso double-layers in 3. Notably, both ligands in 1-3 support argentophilic interactions. Moreover, a luminescent comparison of 1-3, pyridyl-N, and its functional N-oxide ligands is also investigated in detail. [ABSTRACT FROM AUTHOR]

Four isostructural lanthanide metal-organic frameworks (Ln-MOFs) {[Ln(L)1.5(H2O)]•4H2O}n (1-Ln) (Ln = Sm, Eu, Gd, and Tb) have been successfully synthesized under solvothermal conditions with 2-(1H-1,2,4-triazol-1-yl) terephthalic acid (H2L) and Ln(NO3)3•nH2O (n = 0, 6). 1-Ln shows a binodal (3,8)-connected three-dimensional framework that possesses a one-dimensional pore channel decorated with uncoordinated Lewis basic triazolyl sites. 1-Eu and 1-Tb exhibit bright red and green emissions with absolute quantum yields of 9.1% for 1-Eu and 53.3% for 1-Tb. The luminescence explorations demonstrated that 1-Tb exhibits high quenching efficiency and low detection limit for sensing Fe3+ and nitrobenzene. Meanwhile, the fluorescence intensity of the quenched 1-Tb samples was resumed after washing with ethanol, which shows highly selective and recyclable luminescence sensing for Fe3+ and nitrobenzene. Importantly, by doping different concentrations of Eu3+ and Tb3+ ions, a series of dichromatic doped 1-EuxTb1-x MOFs were fabricated, showing an unusual fluent change of the emissions color from green, yellow, orange, orange-red, and red. [ABSTRACT FROM AUTHOR]

Employing a V-shaped rigid multicarboxylate ligand 1,3-di(2',5'-dicarboxypheny)benzene acid (H4L), three microporous metal-organic frameworks (MOFs), H2[Co4(O)L2(H2O)2]·3DMA·8H2O (1), H3[Zn2.5L2]·NMP·5H2O (2), and H3[Cd2.5L2]·4DMF·3H2O (3) were synthesized and characterized. Compound 1 exhibits a cage-based (3,6)-connected rtl topological MOF with [Co4O(COO)8] clusters and highly selective adsorption of CO2 over CH4. Compounds 2 and 3 are isostructural and display a rare 4,8-connected flu net with linear trinuclear [Zn3(COO)6] clusters. Interestingly, when compound 3 was soaked in DMF solution containing Eu3+ ions, an Eu-loaded compound Eu@3 with bright red fluorescence was obtained, which reveals highly selective sensing for Cu2+, Fe3+, and Cr2O72- ions. This represents an unusual example to achieve the detection of Cu2+, Fe3+, and Cr2O72- ions simultaneously by fluorescence spectrometry based on a recyclable Eu-loaded MOF sensor. [ABSTRACT FROM AUTHOR]

Three isostructural lanthanide metal-organic frameworks (Ln-MOFs), {[Ln2(BDPO)1.5(DMA)3(H2O)]·5H2O }n (1-Ln, Ln = Eu, Gd, and Tb) were constructed by a less-investigated large delocalized π-electron conjugated ligand N,N'-bis(3,5-dicarboxyphenyl)-oxalamide (H4BDPO). 1-Ln reveals unprecedented trinodal (4,4,6)-connected networks based on binuclear cluster units and planar BDPO linkers. Density functional theory (DFT) and time dependent-DFT calculations were performed on the ground and excited states to provide insight into geometries, the frontier molecular orbitals, and singlet and triplet state energies of H4BDPO ligand. 1-Eu and 1-Tb exhibit strong typical red and green emission of Eu3+ and Tb3+ ions, respectively, originating from the highly efficient energy transfer from BDPO to metal centers, as demonstrated by the comparison of triplet excited energies of ligands and metal ions. Importantly, by doping different concentrations of Eu3+ and Tb3+ ions, a series of dichromatic doped 1-EuxTb1-x MOFs were fabricated, showing an unusual fluent change of luminescent color among green, yellow, orange, and red. Meanwhile, the trimetallic doped 1-Eu0.0855Gd0.6285Tb0.2860 emits white light, with the correlated color temperature of 5129 K as well as an absolute quantum yield of 22.4%. [ABSTRACT FROM AUTHOR]

In this report, three new luminescent metal-organic frameworks (LMOFs), [Zn(L1)2].CH3CN (1), [Zn(L1)2] (2), and [Zn(L1)(L2)0.5].NMP (3) (HL1 = 6-aminonicotinic acid; H2L2 = terephthalic acid; and NMP = N-methyl-2-pyrrolidone), have been solvothermally synthesized based on d10 metal ion Zn(II) and free organic ligands (HL1 and H2L2) in different solvent systems, all of which have been fully characterized. Single crystal data reveal that 1 and 2 are two 2D isomeride but with different space groups, which is caused by the different solvent systems during the synthesis procedure. The introduction of the bridging ligand H2L2 in the solvent system of 2 produces 3 with the 3D microporous framework. The gas sorption exploration of 3 shows an interesting stepwise gas sorption behavior and attractive low-pressure selectivity between CO2 and CH4, which may be used as a potential material to separate the CO2 from the natural gas. In addition, the luminescent properties of the free ligands and 1-3 have been investigated carefully, and the luminescent mechanisms have also been verified by the DFT calculation of HOMO, LUMO, and HOMO-LUMO gaps of free ligands and 1-3. [ABSTRACT FROM AUTHOR]

A novel K2CO3-mediated cyclization and rearrangement of γ,δ-alkynyl oximes for the synthesis of pyridols is described. The process accomplishes an efficient [1,3] rearrangement of the O-vinyl oxime intermediate which is in situ generated from the intramolecular nucleophilic addition of γ,δ-alkynyl oximes. The reaction employs readily accessible starting materials, tolerates a wide range of functional groups, and gives a variety of synthetically challenging pyridols in good yields. [ABSTRACT FROM AUTHOR]

Three new three-dimensional (3D) luminescent metal-organic frameworks (MOFs), namely, [Zn2(L)2]·2DMA·3H2O (1), [Zn2(L)2]·H2O (2), and [Cd2(L)2]·H2O (3) [H2L = 2-(imidazol-1-yl)terephthalic acid], have been solvothermally synthesized by using d10 metal ions Zn(II)/Cd(II) and H2L in different solvent systems, which have been well characterized by elemental analysis, Fourier transform infrared spectroscopy, powder X-ray diffraction, and thermogravimetric analysis. As influenced by the different solvents and metal ions, single-crystal X-ray diffraction shows that 1 is a three-dimensional (3D) microporous framework with one-dimensional (1D) pores (10.85 × 8.79 Å2) based on the [Zn2(μ2-COO)4] secondary building units, and 2 and 3 are two 3D isostructural networks composed by 1D zigzag chains, which are further connected by L2- ligands into dense packing structures. Topology analyses reveal that 1 can be simplified as a binodal (6,3)-connected ant topological net with a point symbol of (44·63·83)(48·62), and 2 and 3 show binodal (4,4)-connected nets with a point symbol of (4·63·82). Gas sorption behaviors of 1 for N2, H2, CH4, and CO2 have been studied in detail at different temperatures, indicating that the high H2 uptake and high selectivity for CO2 will make it as potential gas storage and separation materials. Moreover, the solid state luminescent properties of 1-3 have also been measured and studied at room temperature. [ABSTRACT FROM AUTHOR]

Four similar Mn(II) metal-organic frameworks (MOFs), {[Mn2(nbtc)(H2O)2(S)]·S·0.5H2O}n [S = DMF (1), DMA (2), NMP (3), DEF (4)] (DMF = N,N'-dimethylformamide, DMA = N,N'-dimethylacetamide, NMP = N-methyl-2-pyrrolidinone, DEF = N,N'-diethylformamide), have been assembled solvothermally from the nitro and carboxyl doubly functionalized ligand 6,6'-dinitro-2,2',4,4'-biphenyl tetracarboxylic acid (H4nbtc) and characterized by single-crystal X-ray diffraction, elemental analyses, infrared spectroscopy, thermogravimetric analyses, and powder X-ray diffraction. All MOFs exhibit unique three-dimensional double-walled open-frameworks with one-dimensional parallelogram channels and have guest/coordinated water and carbonyl solvent molecules, reasonably providing a good example of the competitive behavior of water and carbonyl solvent molecules and an excellent candidate for studying the single crystal coordinated solvent exchange transformations. Interestingly, because of the different steric hindrance of the series of coordinated carbonyl solvent molecules, the MOFs' structural differences primarily display on the coordination mode of O1W and coordination sphere of Mn1/Mn2 between MOFs 1(4) and 2(3). And it is also found that a small variation of the lattice parameters, unit cell volume, and density occurs. Furthermore, MOFs 1-3 show solvent-induced single-crystal-to-single-crystal (SCSC) transformations, which only exchange coordinated and guest carbonyl solvent molecules (DMF, DMA, NMP). And fortunately, the available single crystal data of 2' and 2" have been collected, which were obtained by soaking 1 and 3 in DMA solution for 5 days and 7 days respectively, and they have the same molecular formula as 2 but slightly different structures from 2. In such transformations, the complete solvent exchanging time discrimination of 2 to 3 (10 days), 3 to 2 (7 days), 3 to 1 (5 days), 1 to 2 (5 days), and 2 to 1 (3 days) is susceptible to the size of carbonyl solvent molecules (NMP > DMA > DMF), and the metal coordination sphere of SCSC regenerated samples is influenced not only by the character of coordinated carbonyl solvents but also the nature of mother crystals. In addition, MOFs 1-4 exhibit antiferromagnetic coupling, confirmed through magnetic susceptibility measurements. [ABSTRACT FROM AUTHOR]

Five new Cd(II) complexes, {[Cd1.5(tzia)(H2O)2]·H2O}n (1), {[Cd1.5(tzia)(H2O)4]·1.5H2O}n (2), [Cd(H2tzia)2(H2O)4]·H2O (3), [Cd5(μ3-OH)(tzia)3(H2O)7]·2H2O}n (4), and {[Cd2(μ3-OH)(tzia)(H2O)2]·H2O}n (5) (H3tzia = 5-(1H-tetrazol-5-yl)isophthalic acid), were assembled employing a tetrazolyl-carboxyl ligand H3tzia with Cd(II) ions, revealing versatile structures from zero-dimensional (0D) mononuclear molecule, 2D layer to 3D framework, in which five new types of coordination modes of H3tzia were observed. Complex 1 shows a 3D (3,6)-connected ant net based on trinuclear [Cd3(COO)2(N4C)2] cluster; 2 forms an unusual 3D (3,4)-connected 3,4T1 net with 1D tubes based on the 26-membered metallocycles; 3 is a mononuclear molecule; 4 displays an unprecedented (3,4,10)-connected 2D layer based on pentanuclear [Cd5(μ3-OH)(COO)2(N4C)3] cluster; 5 is a 3D porous framework containing 1D Cd-hydroxy-tetrazolyl ribbons. Complexes 1-5 exhibit strong luminescence with different energies resulted from the various coordination modes of tzia. The mechanism of luminescence was further investigated by density functional theory (DFT) calculations. [ABSTRACT FROM AUTHOR]

On the basis of a temperature-induced effect, the solvothermal reaction of Co(Ac)2·4H2O, 5-amino-2,4,6-triiodoisophthalic acid (H2atibdc), and 1,4-bis(2-methyl-imidazol-1-yl)butane (bib) at 80 °C gave a new coordination polymer [Co(bib)(atibdc)] (1), which shows a two-dimensional (2D) network with left- and right-handed helical chains. By raising the reaction temperature to 130 °C, a pair of homochiral enantiomers [Co(bib)(atibdc)]·2H2O (2, 2M, and 2P) were successfully obtained, displaying a three-dimensional (3D) framework with three kinds of unique helical chains. Keeping the temperature of the reaction system to 150 °C, excited, an in situ iodine elimination reaction occurred, and a new linker 5-aminoisophthalic acid (H2aipa) was generated, which then cooperated with the bib ligand to construct a coordination polymer [Co(bib)(aipa)] (3), showing a 3D 3-fold interpenetrating architecture. The comparison of final solid structures exhibits an exclusive temperature-induced effect on the construction of the coordination polymer. Furthermore, via a single-crystal-to-single-crystal (SCSC) transformation, the 2D network of 1 can be derived from the 3D framework of 2, which presents a rare type of temperature-solvent induced SCSC transformation. In addition, the magnetic properties of 1-3 have been investigated as well. [ABSTRACT FROM AUTHOR]

Seven new isostructural lanthanide metal-organic frameworks (Ln-MOFs), [Ln(Hpzbc)2(NO3)]·H2O (1-Ln, Ln = Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, Er3+, and Yb3+ ions, H2pzbc = 3-(1H-pyrazol-3-yl) benzoic acid), with one-dimensional (1D) channels decorated by nitrate anions and pyrazoyl groups have been constructed. 1-Ln, as revealed by structural analysis, represent uncommon microporous 3D Ln-pyrazoyl-carboxyl systems using pyrazoyl-carboxyl bifunctional ligands as bridges. The luminescent investigations show that 1-Eu is an excellent MOF-based fluorescent probe, with high sensitivity, selectivity, and simple regeneration, for environmentally relevant Fe3+ and Cr2O72- ions. 1-Eu also presents highly selective capture for CO2 over N2 and CH4 due to the multiple binding sites for CO2 molecules, which were supported by Grand Canonical Monte Carlo (GCMC) simulations. [ABSTRACT FROM AUTHOR]

Twomicroporous metal–organic frameworks, [Zn2(HDDCBA)]·2DMF·2H2O (1) and [Cd2(DDCBA)·DMA·H2O]·H2N(Me)2(2) havebeen synthesized under solvothermalcondition by using a less-exploited symmetrical pentacarboxylate ligand,3,5-di(3′, 5′-dicarboxylphenyl)benozoic acid (H5L). Both compounds 1and 2revealthe (5,5)-connected nets based on the binuclear metal clusters andorganic linkers. The desolvated structure of 1(1a) contains two shapes of 1D channel with suitable pore sizeand polar system decorated by uncoordinated carboxylate groups. Asa result, 1apossesses not only high CO2loadingbut also excellent CO2/CH4selectivity at 273and 298 K. In addition, both compounds display solid-state luminescencestemming from the ligand-centered fluorescence of H5L. [ABSTRACT FROM AUTHOR]

Two nanocage-based metal-organic frameworks respectively built on two and three types of clusters with diisophthalate ligand were constructed, displaying unprecedented (3,4,6)-connected nets, unusual nanocages, and new bipaddle-wheel tetranuclear cluster, as well as highly selective CO2 capture. [ABSTRACT FROM AUTHOR]

By a less-exploited strategy, a stable framework was constructed by using 4,4'-biphenyldicarboxylic acid (H2bpdc) and methyl-functionalized 3,3',5,5'-tetramethyl-4,4'-bipyrazole (H2bpz) coligands, revealing a new (6,8)-connected net based on two extremely rare trinuclear and tetranuclear metal-carboxylate-pyrazolate clusters. The framework is very porous and possesses not only high CO2 loadings but also very high CO2/N2 selectivities at 308 and 313 K because of the polar pore surface decorated by clusters, pyrazolyl units, and confined cages with methyl groups dangling. Importantly, GCMC simulation identified two favorable CO2 sorption sites located sequentially near Co3(pz)3 and Co3(CO2)2(pz) motifs of the tetranuclear cluster, and the multipoint framework-CO2 interactions were distinguished. The framework also displays remarkable stability toward water and organic solvents. [ABSTRACT FROM AUTHOR]

Sixnew metal-organic frameworks (MOFs) with structuresranging from a one-dimensional (1D) chain, two-dimensional (2D) layer, even 2D double layer to three-dimensional (3D) network based on 2,2'-bipyridine-3,3'-dicarboxylate-1,1'-dioxide(H2bpdado) and N-donor ligands (1,2-bis(4-pyridyl)ethane(bpa) or 1,2-trans-bis(4-pyridyl)ethene (bpe)),namely, [Cd(bpdado)(H2O)2]n(1), {[Cd2(bpdado)2(bpa)(H2O)2]·DMF·3H2O}n(2), {[Cd2(bpdado)2(bpe)(H2O)2]·8.5H2O}n(3), {[Pb2(bpdado)2(bpa)]·10H2O}n(4), {[Pb2(bpdado)2(bpe)]·10H2O}n(5), [Pb2(bpdado)Cl2(H2O)2]n(6), were synthesized by hydro(solvo)thermal and/or diffusionmethods. In these complexes, the bpdado ligand shows four types of coordination modes, three of which appeared for the first time. Polymers 1-6present diverse motifs with differentmetal ions and different conformations and/or coordination modes ofbpdado, which may show a natural synergy in structural diversity ofthe resultant MOFs. Under the similar synthetic conditions just withdifferent metals (Cd(II) and Pb(II)), 6exhibits a 2Dcovalent grid layer, whereas complex 1displays a 1Dchain. Meanwhile, Cd(II) atom in 1shows an unprecedentedtriangular prism coordination geometry. Although bpe/bpa ligands actas pillars between 2D [M(bpdado)]nlayersubunits in complexes 2-5, the Cd(II)-basedcomplexes 2and 3are extended into a 3Dlayered-pillared network, while the Pd(II)-based complexes 4and 5just exhibit the 2D double layers. Moreover, the 2D [Cd(bpdado)]nlayer subunits of 2and 3can be derived from replacing hydrogenbonds in 1D 1with coordination bonds dependent on differentcoordination modes of bpdado. In addition, the solid-state luminescence(for 1-6) and gas adsorption properties(for 2and 3) have been studied and discussedin detail. [ABSTRACT FROM AUTHOR]

A facilebenzoyl peroxide (BPO) mediated ortho-hydroxylationand benzoylation of N-alkyl anilinesfor the synthesis of 2-benzamidophenols has been developed.The reaction tolerates a wide range of functional groups and is agood method for the straightforward synthesis of valuable 2-benzamidophenolsin good yields under mild conditions. [ABSTRACT FROM AUTHOR]

A novelruthenium-catalyzed cyclization of ketoxime carboxylateswith N,N-dimethylformamide (DMF)for the synthesis of tetrasubstituted symmetrical pyridines has beendeveloped. A methyl carbon on DMF performed as a source of a one carbonsynthon. And NaHSO3plays a role in the reaction. [ABSTRACT FROM AUTHOR]

A rarelyreported L1D (left-handed helical 1D chain) + R1D (right-handedhelical 1D chain) → 3D polycatenated network, [Cd(H2ttac)bpp]n(1), constructedfrom the vertical interpenetration of triple-stranded homochiral helices,has been synthesized under hydrothermal condition by H4ttac (1,1′,2′,1″-terphenyl-4,4′,4″,5′-tetracarboxylicacid), 1,3-bis(4-pyridyl)propane (bpp), and Cd(NO3)2·4H2O. The luminescent properties of 1and the ones immersed in various kinds of organic compoundsand nitrate@DMF solutions have been investigated. Importantly, 1shows highly sensitive response to nitro aromatic compoundsand Cu2+through luminescence quenching effects, makingit a promising luminescent sensor for nitro aromatic compounds andCu2+. Besides, experiments upon deprotonation by NaOH,KOH, methylamine, and triethylamine are conducted, respectively. Asbase increases, the luminescence spectra exhibit gradual blue shifts.The mechanisms of the sensing properties have been studied in detail. [ABSTRACT FROM AUTHOR]

A novel palladium-catalyzed oxidative double carbonylation of o-iodoanilines for the synthesis of isatoic anhydrides has been developed. The reaction employs readily available o-iodoanilines as the starting materials and proceeds under mild conditions. For extension, palladium-catalyzed oxidative carbonylation of anthranilic acids was developed for the synthesis of substituted isatoic anhydrides in high to excellent yields. [ABSTRACT FROM AUTHOR]

Twoisomeric metal–organic frameworks, consisting of Co-triazolatelayers and positional isomeric dicarboxylate pillars, both show distincttemperature-dependent CO2sorption behaviors. Because ofthe pores functionalized by amino groups, both materials have highCO2uptake and highly selective sorption of CO2over CH4and N2. [ABSTRACT FROM AUTHOR]

Elevennew multidimensional transition coordination polymers, [Cd2(dcpy)2(H2O)] (1), [Cd(dcpy)]·H2O (2), [Cd(dcpy)(H2O)1.5]·2H2O (3), [Cd(dcpy)(bipy)0.5(H2O)]·5H2O (4), [Cd2(dcpy)2(bipy)(H2O)3]·2.5H2O (5), [Cd2(dcpy)2(bipy)]·4H2O(6), [Cd(dcpy)(bpa)0.5]·2H2O (7), [Ni(dcpy)(H2O)2] (8), [Ni(dcpy)(bpe)0.5(H2O)]·3H2O (9), [Ni(dcpy)(bpe)0.5(H2O)]·0.5H2O (10), and [Ni(dcpy)(bpa)0.5(H2O)2]·H2O (11), havebeen synthesized by using a tritopic ligand 3-(2′,5′-dicarboxylphenyl)pyridineacid (H2dcpy) and three different N-donor ancillary ligands(bipy = 4,4′-bipyridine, bpe = 1,2-bi(4-pyridyl)ethene,and bpa = 1,2-bi(4-pyridyl)ethane) in different solvents andtemperatures. 1is a four-connected three-dimensional(3D) framework based on two kinds of Cd–O–Cd and Cd–(COO)–Cdchains. 2shows also a four-connected 3D framework withone-dimensional (1D) channels formed by double left- and right-handedhelical chains. 3displays a 3D microporous frameworkcomposed of Cd2O3as a secondary building unit(SBU) with a (4,6)-connected net. 4is a two-dimensional(2D) layer based on Cd2O2SBU and further stacksto generate a 3D supramolecular framework with open channels. 5is a rare 3D homochiral microporous framework with left-handedhelical chains. 6presents the first (3,4,6)-connected3D self-penetrating framework based on 1D metal–organic nanotubes(MONTs). 7is a (3,4)-connected 3D microporous pillar-layerframework with 1D square channels filled by left- or right-handedhelical water clusters chains. 8is a 2D (3,6)-connectednet based on Ni2dimers. 9shows a wavelike2D stacked layer framework possessing two types of open channels. 10is a structural isomer of 9, showing an intriguing(3,4)-connected self-penetrating network, while 11exhibitsa 2D (3,4)-connected layer. The effects of solvents, temperatures,metal cations, and the lengths and rigidness/flexibility of the dipyridylligand on the crystal architectures are discussed. The solid-statephotoluminescence for 1–7and themagnetic properties for 8were also investigated. Gasadsorption studies for 9shows a high selective adsorptionof CO2over N2. [ABSTRACT FROM AUTHOR]

Three new coordination polymers, [Ag4(H2bpz)4(SO4)2]·H2O (1), [Ag2(H2bpz)2(SO4)]·3H2O (2), and [Ag3(H2bpz)4](SO4)2/3(OH)5/3·4H2O (3) have been solvothermally synthesized with Ag2SO4 and flexible ligand 3,3',5,5'-tetramethyl-4,4'-bipyrazole (H2bpz) in different solvents and temperatures. Complex 1 is a 2-fold interpenetrated three-dimensional (3D) framework with an uncommon (3,5)-connected hms topology. Complex 2 is a structural isomer of 1 and shows a three-connected 2D ths net consisting of interesting 3-fold and 2-fold heterochiral helical chains. Complex 3 discloses a grid layer structure, containing heterochiral helical chains and an unusual meso-helix. More interestingly, three sets of layers in 3 stack in different directions, affording an unprecedented 2D + 2D + 2D ? 3D polycatenating cationic framework with 1D + 3D porous systems. In 1-3, H2bpz exhibit exobidentate bridging fashions with wide-ranged interpyrazole tilting angles and changeable coordination configurations, such as cis and trans fashions in 1 and 3 and uniform trans fashion in 2. These lead to the isomeric [Ag(H2bpz)]n arrays of wavelike and helical chains in 1 and 2, respectively. Complexes 1-3 display solid-state photoluminescence stemming from the ligand-centered fluorescent emissions of H2bpz. Because of the highly polar framework, 3 shows excellent adsorption selectivity for CO2 over N2. [ABSTRACT FROM AUTHOR]

Under solvothermalconditions, six new Zn(II) coordination polymers,[(CH3)2NH2]2[Zn(L)]·2H2O (1), [Zn2(L)(py)2] (2), [Zn2(L)(bpe)2]·bpe·6H2O (3), [Zn2(L)(bpe)(DMA)(H2O)]·5H2O (4), [Zn2(L)(bpy)0.5(H2O)2]·2.5H2O (5), and [Zn2(L)(bpe)(H2O)]·3H2O (6) [H4L = 5,5′-(p-xylylenediamino)-1,1′,3,3′-(benzenetetra-carboxylicacid), py = pyridine, bpy = 4,4′-dipyridine and bpe = 1,2-bis(4-pyridyl)ethane],have been synthesized by employing a flexible tetracarboxylic acidH4L and different auxiliary pyridine-based ligands. In 1–6, all L4–ligandsare 4-connected nodes; however, the diverse configurations of thetwo terminal isophthalate units of L4–around thecentral −NHCH2PhCH2NH– spacerlead to various topological nets. 1shows a three-dimensional(3D) 2-fold interpenetrated 4-connected dianetwork resultingfrom the vertical configuration of the two isophthalate units of L4–. 2displays a 3D (4,4)-connected ptsnet in which the two isophthalate units of L4–adopt a parallel configuration. The two isophthalate units of L4–in 3are also almost parallel, resultingin an intriguing 3D 2-fold interpenetrated network with the (4,4)-connected bbfnet. 4is a two-dimensional bilayer structure,extending into a 3D supramolecular framework through interlayer hydrogen-bondinginteractions. 5and 6disclose similar 3Dstructural architectures, in which the two isophthalate units of L4–are almost vertical and exhibit tetrahedral topologicalnodes, inducing a rare (4,5)-connected xwwnet and anunprecedented (4,6)-connected network, respectively. The thermal stabilitiesand luminescent properties of 1–6have also been studied in detail. The complexes exhibit intensesolid-state fluorescent emissions at room temperature. [ABSTRACT FROM AUTHOR]

Fiveisostructural three-dimensional (3D) lanthanide (Ln) frameworks[LnCl(bpdc)(DMF)] (Ln = La (1), Ce (2),Pr (3), Nd (4), and Sm (5),H2bpdc = 4,4′-biphenyl-dicarboxylic acid, DMF = N,N-dimethylformamide) have been solvothermally synthesizedand characterized by TGA, IR, and X-ray single crystal diffraction.The frameworks contain unusual Ln-carboxylate/Cl chains, and whichare extended by bpdc2-linkers to form 4-connected sranetworks with 1D rhombic channels. The effect of lanthanide contractioninduces the decreases of average Ln–O and Ln–Cl distancesfrom La to Sm. 4exhibits strong characteristic luminescenceof Nd3+ions in the near-infrared (NIR) region, resultingfrom the sensitization of bpdc2–. 3displays weak NIR emission due to the inefficient sensitizationof Pr3+ions. The depopulation of the Stark levels andpossible antiferromagnetic interactions within the Ln-carboxylate/Clchains lead to the continuous decreases of χMT for 2–4along the decreasing temperatures. [ABSTRACT FROM AUTHOR]

By reacting a tritopic ligand 5-(4-carboxyphenyl)nicotinicacid(H2cpna) with Co(NO3)2under differentconditions, two new three-dimensional (3D) frameworks, [Co2(cpna)2(H2O)3]·DMF·9(H2O) (1) and [Co4(cpna)4(H2O)8] (2), have been obtained. Theyexhibit (3,6)-connected topological nets based on Co2clustersand Y-shaped trinodal cpna2–linkers. 1presents a chiral anhnet with the right-handed helicalchannels, while 2shows an achiral framework with a rtltopology. The whole structures of 1and 2are constructed from 2D achiral layers interconnected bytriangular cpna2–nodes. Notably, these layers containtwo heterochiral vertical and parallel 21helical chainsfor 1and 2, respectively, and those chainsare constructed with 4-connected tetrahedral or square planar centersin their respective layers. The magnetic studies indicate that 1and 2show antiferromagnetic and weak ferromagneticexchanges transmitted through μ2-Owater/μ1,3-carboxylate bridges and carboxylate singleμ2-O bridges between Co2+ions in theCo2dimers, respectively. In addition, 1displaysmicroporous sorption for N2and CO2. [ABSTRACT FROM AUTHOR]

Copper-catalyzed coupling of oxime acetates with aldehydes offers a new strategy for the synthesis of highly substituted pyridines. This novel method tolerates a wide range of functionality and allows for rapid elaboration of the oxime acetates into a variety of substituted pyridines. [ABSTRACT FROM AUTHOR]

In this contribution, we devote our effort to explore the effect of stoichiometry of the 4,4′-dipyridylsulfide (dps) ligand on the final structures in the ZnII-hfipbb binary system (H2hfipbb = 4,4′-(hexafluoroisopropylidene)bis(benzoic acid)). The solvothermal reaction of zinc acetate and H2hfipbb with the different stoichiometries of dps from 0.1 to 0.4 mmol has resulted in three new coordination polymers, [Zn(hfipbb)(H2hfipbb)0.5]n(1) and [Zn2(hfipbb)2(dps)(H2O)]n(2aand 2b). The structure determination reveals that complex 1displays a three-dimensional (3D) 2-fold parallel interpenetrating pillared-layer network with one-dimensional double left- and right-handed helical tubes. Complexes 2aand 2bare framework-isomeric as two unusual (3,4)-connected 3D coordination networks, i.e., a 4-nodal (7·82)(4·7·9)(72·84)(4·72·8·92) net and 2-fold interpenetrating (83)2(85·10) net. In addition, the properties of thermogravimetric analysis, X-ray powder diffraction, and photoluminescent behaviors of the complexes have been also discussed. [ABSTRACT FROM AUTHOR]

Six new coordination polymers, namely, [Zn(3-PyHBIm)(oba)H2O] (1), [Cd(3-PyHBIm)(oba)H2O] (2), [Ni(3-PyHBIm)(oba)H2O]·3H2O (3), [Zn(4-PyHBIm)(oba)] (4), [Cd(4-PyHBIm)2(oba)]·H2O(5), and [Co(4-PyHBIm)2(oba)]·H2O (6) were synthesized under hydrothermal conditions based on 2-(n-pyridyl)benzimidazole (n-PyHBIm) and 4,4′-oxybis-(benzoate) (oba) ligands. The compounds were characterized by single crystal X-ray diffraction, IR, and thermogravimetric and elemental analyses. Compounds 1and 2contain simple one-dimensional (1D) polymeric chains assembled into a three-dimensional (3D) network through aromatic π–π stacking interactions and hydrogen bonding interactions. Compound 3contains 1D polymeric chains with side arms which assembled into a two-dimensional (2D) network with channels and further assembled into a 3D network though C–H···π interactions. Compounds 4and 5form 1D molecular ladder coordination polymers. Compound 6consists of 2D coordination networks with 2-fold interpenetration. The luminescence properties of 1, 2, 4, and 5were studied in the solid state at room temperature. [ABSTRACT FROM AUTHOR]