Search

Coordination polymers (CPs) are organo-inorganic porous materials consisting of metal ions or clusters and organic linkers. These compounds have attracted attention for use in the fluorescence detection of pollutants. Here, two Zn-based mixed-ligand-bearing CPs, [Zn2(DIN)2(HBTC2−)2] (CP-1) and [Zn(DIN)(HBTC2−)]·ACN·H2O (CP-2) (DIN = 1,4-di(imidazole-1-yl)naphthalene, H3BTC = 1,3,5-benzenetricarboxylic acid, and ACN = acetonitrile), were synthesized under solvothermal conditions. CP-1 and CP-2 were characterized by single-crystal X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, elemental analysis, and powder X-ray diffraction analysis. Solid-state fluorescence analysis revealed an emission peak at 350 nm upon excitation at 225 and 290 nm. Fluorescence sensing tests showed that CP-1 was highly efficient, sensitive, and selective for detecting Cr2O72− at 225 and 290 nm, whereas I− was only detected well at an excitation of 225 nm. CP-1 detected pesticides differently at excitation wavelengths of 225 and 290 nm; the highest quenching rates were for nitenpyram at 225 nm and imidacloprid at 290 nm. The quenching process may occur via the inner filter effect and fluorescence resonance energy transfer.

Coordination polymers (CPs) are organo-inorganic porous materials consisting of metal ions or clusters and organic linkers. These compounds have attracted attention for use in the fluorescence detection of pollutants. Here, two Zn-based mixed-ligand-bearing CPs, [Zn2(DIN)2(HBTC2−)2] (CP-1) and [Zn(DIN)(HBTC2−)]·ACN·H2O (CP-2) (DIN = 1,4-di(imidazole-1-yl)naphthalene, H3BTC = 1,3,5-benzenetricarboxylic acid, and ACN = acetonitrile), were synthesized under solvothermal conditions. CP-1 and CP-2 were characterized by single-crystal X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, elemental analysis, and powder X-ray diffraction analysis. Solid-state fluorescence analysis revealed an emission peak at 350 nm upon excitation at 225 and 290 nm. Fluorescence sensing tests showed that CP-1 was highly efficient, sensitive, and selective for detecting Cr2O72− at 225 and 290 nm, whereas I− was only detected well at an excitation of 225 nm. CP-1 detected pesticides differently at excitation wavelengths of 225 and 290 nm; the highest quenching rates were for nitenpyram at 225 nm and imidacloprid at 290 nm. The quenching process may occur via the inner filter effect and fluorescence resonance energy transfer. [ABSTRACT FROM AUTHOR]

• Structural features of lanthanide coordination polymers are reviewed. • Crystal structures of lanthanide coordination polymers are provided. • Coordination environment of lanthanides is discussed. • The role of lanthanides in modulating the structural pattern is revealed. • Catalytic applications of lanthanide coordination polymers are highlighted. The review showcases the structural features of an array of recently reported lanthanide coordination polymers with catalytic properties. The field of lanthanide coordination polymers has considerably progressed during the last decade placing it at the forefront of the materials science. The wealth of obtained data clearly demonstrates that lanthanides play a determinant role in tailoring the structural pattern, coordination environment, dimensional configuration and network architecture of coordination polymers. As a rule, the lanthanide(III) ions possess a high coordination number and a large atomic radius, and because of that they tend to generate highly connected complex structures with different coordination geometry. In this way, they easily build two-dimensional and three-dimensional architectures with definite channels and permanent pores. Owing to their strong oxophilic propensity and hard Lewis acid character, lanthanides effectively succeed in creating robust, stable coordination polymers and MOF structures and viable matrices via strongly binding the coordinating groups of the accurately selected organic linkers. Such unique particularities involve a distinct morphology, diverse crystal structures, uniform porosity, a defined pore size and shape, precisely controlled number and dimensions of channels. Their specifically designed configurations allow the access of guest molecules and a controlled distribution of the metal ions on the surface or within the network. Additionally, the lanthanide ions afford new synergistic Lewis acid sites beneficial for productive catalytic applications. These attractive capabilities of lanthanide coordination polymers enabled them to be fruitfully used as sustainable and recyclable heterogeneous catalysts in diverse organic transformations. like carbon-carbon bond forming, Strecker reaction, CO 2 cycloaddition, Knoevenagel condensation, hydroboration and cyanosilylation. [ABSTRACT FROM AUTHOR]

• Two metal organic frameworks (MOFs) with 2D and 3D architectures were synthesized and characterized. • Both of the CPs exhibit two excitation with similar intensity and one emission. • And, each of the excitation exhibited specific preference towards the quenchers (230 nm for nitenpyram (NTP) and 290 nm for imidacloprid (IMI). Two metal organic frameworks (MOFs) with 2D and 3D architectures were synthesized and characterized, namely: [Cd(DIN)(TPA)(H 2 O)] n (DIN = 1,4-di(imidazol-1-yl)naphthalene, H 2 TPA = terephthalic acid) (Cd-1) and {[Cd(DIN)(FDC)(H 2 O)]·H 2 O} n (H 2 FDC = furan-2,5-dicarboxylic acid) (Cd-2). The structures and purities of Cd-1 and Cd-2 were revealed by elemental analyses, infrared spectra (IR), thermogravimetric analyses (TGA), single-crystal X-Ray diffraction analysis (SCXRD) and powder X-Ray diffraction (PXRD). Both two MOFs exhibited luminescence emission apexes around 350 nm upon relative incident light wavelengths of 230 and 290 nm. As a fluorescence sensor, Cd-1 shows a highly sensitive and selective ability towards I− (λ ex = 230 nm) and Cr 2 O 7 2− (λ ex = 230 and 290 nm) during sensing of the ions. For sensing of the pesticides, the sensor shows a different performance. The sensor exhibits the highest quenching rates towards NTP and IMI upon excitation at 230 and 290 nm, respectively. [Display omitted] [ABSTRACT FROM AUTHOR]

The synthesis and structural characterization of four new 1D to 3D CPs have been reported. The Zn based CP was further used in fluorescent sensing of the ions, antibiotics and pesticides. The CP exhibited specific preference towards the quenchers (Fe3+, MnO 4 −, Cr 2 O 7 2−, SMZ, DMZ, IMI and MMT). [Display omitted] A series of four 1D to 3D coordination polymers (CPs), namely: [Zn(DTP)SO 4 (H 2 O) 3 ] n (CP-1), (DTP = 3,5-di(1,2,4-triazol-1-yl)pyridine); [Co(DTP) 2 (NO 3) 2 (H 2 O) 2 ] n (CP-2); [Cu 2 (DTP) 2 Cl 4 (H 2 O)] n (CP-3) and [Cu 4 (DTP) 2 (H 2 PO 4) 2 (HPO 4) 3 (H 2 O)] n (CP-4), were synthesized from the reaction of Zn(II), Co(II), Cu(II) ions with the DTP ligand under solvothermal conditions. Structural information on the CPs was obtained from single crystal X-ray diffraction analysis, together with the additional characterization methods of elemental analysis, IR spectroscopy and thermogravimetric analysis (TGA), which were also employed to confirm the purity of the products. In addition, the fluorescence properties of CP-1 were further evaluated and used in a process for the fluorescent sensing of ions, antibiotics and pesticides in an aqueous medium. The results revealed that the sensor displayed extra high sensitivities for ions (Fe3+, MnO 4 −, Cr 2 O 7 2−), antibiotics ((1,2-dimethyl-5-nitroimidazole (DMZ), sulfamethazine (SMZ)) and pesticides (imidacloprid (IMI) and metamitron (MMT)). A mechanistic investigation showed that the inner filter effect (IFE) and the fluorescence resonance energy transfer (FRET) effect played dominant roles during the fluorescent quenching process. [ABSTRACT FROM AUTHOR]

Two series of Ln-MnII heterometallic coordination polymers (HCPs), [Ln8Mn3(µ3-OH)8(IN)14Cl6(H2O)16] n(OH)2 n ·5 nDMF ·8 nH2O {Ln = Gd ( 1); Ln = Dy ( 2)} and [Ln2Mn(IN)6Cl2(H2O)4] n ·2 nDMF {Ln = Gd ( 3); Ln = Dy ( 4), IN = isonicotinic cation}, were synthesized by using fractional crystallization and structurally characterized. Polymers 1 and 2 are isostructural and form a 2D double layer of [Ln4(µ3-OH)4] cubane and Mn(IN)4Cl2 units, whereas 3 and 4 are isomorphic and form a four-connected cds-type 3D framework assembled from paddle-wheel binuclear Ln2(COO)4 units and planar Mn(IN)4Cl2 units. Polymers 1- 4 exhibited large magnetic entropy changes of 42.0, 16.7, 31.5, and 16.6 J kg-1 K-1, respectively (Δ H = 7 T). In addition, compounds 2 and 4 displayed field-induced slow magnetic relaxation behavior. [ABSTRACT FROM AUTHOR]

Three metal-organic coordination polymers {[Co(pbmb)(chadc)]·2HO} ( 1), {[Zn(pbmb)(chadc)]·2HO} ( 2), and [Ag(pbmb)(chadc)] ( 3) (pbmb = 1,1′-(1,3-propanediyl)bis(2-methylbenzimidazole), chadc = cis-1,2-cyclohexanedicarboxylate anion), have been hydrothermally synthesized by self-assembly of a flexible bis(2-methylbenzimidazole) ligand and one dicarboxylate anion with three kinds of metal salts. All the compounds were characterized by single-crystal X-ray diffraction and physico-chemical spectroscopic methods. Complexes 1 and 2 possess a 1D sequence of fused rings and 3 shows a 1D helical chain structure, which are bridged by pbmb and chadc ligands. Complex 2 and 3 are further packed into 2D and 3D supramolecular architectures by diverse π- π interactions, respectively. The investigation as heterogeneous catalyst in a Fenton-like process for 1- 3 reveals different performances. In addition, the fluorescence properties of 1- 3 have been investigated in the solid state. [ABSTRACT FROM AUTHOR]

Seven coordination polymers {[M(L)2(H2O)2]·(NO3)2}n(M = Co (1), Ni (2), Cd (3)) and [M(L)(ox)]n(M = Co (4), Ni (5), Zn (6), and Mn (7)) have been synthesized (L = 2,6-bis(imidazol-1-yl)pyridine, ox = oxalate) under hydrothermal conditions. Single-crystal X-ray diffraction analysis has revealed that1–3are isomorphous and possess 2-D networks, whereas4–6are isomorphous, but involve two kinds of oxalate chains. The structure of7is different from those of4–6due to various bridging modes of the oxalate ligand. Magnetic studies have revealed that1,2,4,5, and7exhibit strong antiferromagnetic coupling. Among these,1exhibits an interesting spin-canting phenomenon. In hydrothermal reactions, seven coordination polymers were synthesized. Single-crystal X-ray diffraction analysis revealed that compounds1–3possess 2-D networks, whereas compounds4–6involve two kinds of oxalate chains. The structure of7adopts a 3-D framework structure due to various bridging modes of the oxalate ligand. Magnetic studies have revealed that compounds1,2,4,5, and7exhibit strong antiferromagnetic coupling. [ABSTRACT FROM AUTHOR]

To explore the influence of different aromatic polycarboxylates on the self-assembly and properties of d10 metal coordination frameworks, six coordination compounds containing a flexible bis(2-methylbenzimidazole) (pbmb) ligand, formulated as [Ag2(pbmb)(2,6-napdc)]n (1), {[Zn(pbmb)(tbta)]·H2O}n (2), {[Cd(pbmb)(tbta)]·H2O}n (3), [Zn2(pbmb)(btec)(H2O)]n (4), {[Zn2(OH)(pbmb)(bpdc)1.5]·H2O}n (5), and [Cd(pbmb)(3-npa)(H2O)]n (6), have been synthesized under hydrothermal conditions and characterized by physicochemical and spectroscopic methods as well as single-crystal X-ray diffraction analysis (2,6-H2napdc = 2,6-naphthalenedicarboxylic acid, H2tbta = tetrabromoterephthalic acid, H4btec = 1,2,4,5-benzenetetracarboxylic acid, H2bpdc = biphenyl-4,4′-dicarboxylic acid and H23-npa = 3-nitrophthalic acid). Complex 1 possesses an 8-connected 3D coordination framework with sqc3 topology based on rare tetranuclear Ag(i)-cluster secondary building units (SBUs). 2 and 3 possess 2D (4,4) grid structures. 4 shows a novel (3,4,5)-connected 2D network with the Schläfli symbol of {3·4·5}{3·42·52·6}{3·43·53·6·72}. 5 features a uninodal (4,4)-connected net containing binuclear {Zn2(OH)} SBUs and a 2-fold interpenetrating (3,6)-connected supramolecular framework with {42·6}{44·610·8}-3,6T24 topology that is formed via hydrogen bond interactions. Complex 6 is a 1D double-chain structure, which is finally extended to a 3D (4,5,5)-connected supramolecular network via hydrogen bonding interactions. Complexes 1–6 indicate high thermal stabilities and different photoluminescence behavior in the solid state. Moreover, all of these polymer materials manifest excellent photocatalytic activities for the degradation of methyl orange in the photo-Fenton-like process after 120 min (1: 99%, 2: 66%, 3: 91%, 4: 83%, 5: 91% and 6: 93%, respectively). [ABSTRACT FROM AUTHOR]

A new 2D coordination polymer [Ba(Nyaia)(H 2 O)] n 1 (H 2 Nyaia = 5[(naphthalene1-methylene)amino]-isophthalic acid) was obtained and structurally characterized. Compound 1 shows good fluorescence sensing performance in detecting Fe3+ and nitroaromatic compounds. This result indicates that compound 1 has potential application value in bi-function fluorescent sensing materials. [Display omitted] • A new 2D coordination polymer [Ba(Nyaia)(H 2 O)] n 1 (H 2 Nyaia = 5[(naphthalene1-methylene)amino]-isophthalic acid) was prepared. • This work provides a strategy for the design and synthesis of a bi-function fluorescent sensor. • Compound 1 has highly sensitive for the detection of Fe3+ and nitroaromatic compounds with the K sv in 105 M−1 value. It is important to develop a simple and multi-response fluorescence sensor for practical applications. Coordination polymer materials are widely used in fluorescence sensor design due to their excellent photoluminescence properties. Herein, a new 2D coordination polymer [Ba(Nyaia)(H 2 O)] n 1 (H 2 Nyaia = 5-[(naphthalene-1-methylene)amino]-isophthalic acid) with good thermal stability was prepared through H 2 Nyaia and barium(II) nitrate under the solvothermal method. Compound 1 as a bi-functional fluorescent sensor has highly sensitive fluorescence quenching for detecting Fe3+ with the quenching constant (K sv) value of 6.57 × 105 M−1 and 4-nitrophenol (4-NP) with the K sv value of 4.44 × 105 M−1. [ABSTRACT FROM AUTHOR]

Solvothermal reactions of the tricarboxylic acid ligand, biphenyl-3,3',5-tricarboxylic acid (H3bpta), and rare earth nitrate (Ln(NO3)3·6H2O) in the presence of KOH or DMF produced eight 1D linear coordination polymers, namely, [La(bpta)(H2O)5· (H2O)3]n (1), [Pr(bpta)(H2O)5.(H2O)2.5]n (2), [Nd(bpta)(H2O)5·(H2O)1.75]n (3), [Sm(bpta)(H2O)5·(H2O)0.5]n (4) and [Ln(bpta)(DMF)(H2O)3·(H2O)]n [Ln = Eu (5), Gd (6), Tb (7), Dy (8)]. The 1D chain further assembles into a 3D supramolecular network structure through hydrogen bonds and π-π stacking among chains. Complexes 3-5 and 7 display the typical emission spectra for lanthanide-centred luminescence. The optical properties of 5 were analysed in detail and coincide well with the structural properties. The influence of temperature on the luminescence lifetime of 6 has been studied and different non-radiative decay paths have been discussed. The magnetic properties show that 4 and 5 exhibit strong spin-orbit coupling, while weak antiferromagnetic coupling exists in 6. [ABSTRACT FROM AUTHOR]

[Display omitted] • Two semiconductive Ba(II)-based CPs 1 and 2 with small exciton binding energy (E b) values were successfully prepared. • The 2 -based film detector achieves superior direct X-ray detection performance among CP-based detectors. • The enhanced π-π interactions are beneficial to exciton separation and charge carrier transport irradiated by X-ray. High-performance and low-cost X-ray detector is crucial for medical imaging, nondestructive industrial detection and security checks. Semiconductive coordination polymers (CPs) with designable structures, tunable property and high cost-effectiveness have recently emerged as promising materials in direct X-ray detection. However, due to the strong Coulomb interactions between photogenerated electrons and holes, most of CPs often exhibit high exciton binding energies, resulting in relatively insufficient exciton dissociation as well as low photocurrent output and detection sensitivity in turn. Here, we employed the anthracene-based ligand to obtain two semiconductive CPs, {[Ba 2 (Hadba) 4 (DMF) 8 ]·DMF} n 1 (H 2 adba = 4,4′-(9,10-anthracenediyl)dibenzoic acid, DMF = N , N -dimethylformamide) and [Ba(Hadba) 2 (DMA) 4 ] n 2 (DMA = N , N -dimethylacetamide). Both of them can effectively convert X-ray into electrical signals. Compared with compound 1 , compound 2 has a reduced E b (44.9 meV) caused by the reinforced π-π interactions, contributing to the facilitated carrier transport, a significant enhance in mobility-lifetime product (μτ) and detection sensitivity irradiated by X-ray. Based on the optimized detection performance, we prepared a flexible 2 -based composite film detector with a low detection of 1.02 μGy/s that meets the standard for medical imaging. In particular, this film-based detector achieves a high sensitivity of 137.31 μCGy−1 cm−2 and μτ product of 3.03 × 10−3 cm2 V−1, which are superior to all previously reported CP-based detectors and much higher than commercial α -Se. Simultaneously, a 5 × 5 pixelated X-ray imaging device was further constructed to show its potential application in direct X-ray detection and imaging. [ABSTRACT FROM AUTHOR]

A novel Zn-based CP was synthesized and structurally characterized, which were used to prepare a series of Fe-doped Zn-based CP composites by a facile approach. The Fe@Zn-CP-2 acted as efficient visible-light responsive photocatalyst for chlortetracycline, tetracycline and oxytetracycline degradation. [Display omitted] • A series of Fe doped Zn-CP composites were designed by a facile approach. • The Fe@Zn-CP-2 exhibited superior photoactivity toward degradation of CTC, TC and OTC. • The photocatalyst showed excellent photocatalytic activity after five repeated cycles. • The photocatalytic mechanism of the Fe@Zn-CP composites have been deeply investigated. We developed the novel Fe-doped Zn-based coordination polymer (CP) composites (Fe@Zn-CP-n, n = 1–3) with superior visible-light-driven photocatalytic activity. Herein, the Fe@Zn-CP composites were prepared using a newly designed Zn-CP {[Zn(3-padpe)(1,3-BDC)]·H 2 O} n using mixed ligands 4,4′-bis(3-pyridylformamide)diphenylether (3-padpe) and 1,3-benzenedicarboxylic acid (1,3-H 2 BDC) and FeSO 4 by a facile approach at room temperature. The degradation of several tetracyclines (TCs), such as chlortetracycline (CTC), tetracycline hydrochloride (TC), and oxytetracycline (OTC) under visible-light irradiation were used to assess the photocatalytic performance. The generated ideal Fe@Zn-CP-2 composite showed high photocatalytic activity under visible light irradiation, for which the removal rate of antibiotics were 90.60% for CTC in 100 min, 90.00% for TC in 100 min, and 87.70% for OTC in 30 min, respectively. The superior photocatalytic performance was attributed to the Fe–O bond formation which expanded the optical absorption range and significantly increased the separation effectiveness of photogenerated charges. These properties enhanced the photoactivity of Fe@Zn-CP-2 for photocatalytic reaction under visible light irradiation. Additionally, the Fe@Zn-CP-2 showed excellent photostability and recycleability. The detailed intermediates and pathway of CTC degradation were also illustrated. According to the quenching studies and electron spin resonance (ESR) spectra characterization, the main species involved in the photocatalytic reaction were the radicals h+ and O 2 –. In addition, the possible photocatalytic reaction mechanisms were deeply discussed. This work offers fresh insight into the design of CP-based photocatalytic materials and demonstrates the broad application potential of Fe@Zn-CP composites in environmental remediation. [ABSTRACT FROM AUTHOR]

A series of coordination polymers, namely, [Zn(L)(HIP)(H 2 O)] ( 1 ), [Cd(L)(HIP)]·1/2H 2 O ( 2 ), [Co 1.5 (L)(BTC)(CH 3 OH)(H 2 O) 3 ]·2H 2 O ( 3 ), [Ni 1.5 (L)(BTC)(H 2 O) 4 ]·3H 2 O ( 4 ), where L = 2-(4-Chloro-phenoxy)-N-pyridin-3-ylacetamide, H 2 HIP = 5-hydroxyisophthalic acid, H 3 BTC = 1,3,5-benzenetricarboxylic acid, have been synthesized under hydrothermal conditions. Single crystal X-ray diffraction analysis reveals that the complexes 1 , 3 and 4 display 1D chain structure. In complex 2 , each Cd 2 unit is linked into BTC form two dimensional layer structures, which are further connected by μ 2 -L ligand to construct 3D architecture with {4 24 ;6 4 }- bcu topology. Moreover, their powder X-ray diffraction analysis, thermostability and luminescence properties are explored. [ABSTRACT FROM AUTHOR]

• Three 2D to 3D metal-organic frameworks (MOFs) bearing mixed ligands were synthesized and characterized. • It is interesting to notice that three MOFs exhibit two excitation and one emission. • Each of the excitation of the sensor exhibit specific preference towards the quenchers (230 nm for nitenpyram and 290 nm for imidacloprid). The synthesis and characterization of three 2D to 3D metal-organic frameworks (MOFs) with mixed ligands, namely {[Cd(DINT)(TPA)(H 2 O)]ACN} n (BAO24) (H 2 TPA = tere phthalic acid, DINT = 1,4-di(imidazol-1-yl)naphthalene, and ACN = acetonitrile), {[Cd(DINT)(IPA)]DMF} n (BAO25) (H 2 IPA = iso phthalic acid and DMF = N,N -dimethylformamide), and [Cd(DINT)(PA)] n (BAO26) (H 2 PA = phthalic acid), were reported herein. The structures and purities of the MOFs were revealed and confirmed by single-crystal X-Ray diffraction, Fourier transform infrared spectroscopy, powder X-Ray diffraction, thermogravimetric analysis, and elemental analysis. The MOFs exhibited a fluorescence emission peak around λ em = 340 nm with relative excitation wavelengths at both 230 and 290 nm. Since the MOFs showed similar fluorescence properties, BAO24 was selected as a representative MOF in the fluorescent sensing processes. The result showed that BAO24 exhibited a high sensitivity for vitamin B2. However, when sensing pesticides, the sensor performed differently at each excitation wavelength. At λ ex = 230 nm, the sensor was quenched the most significantly with the nitenpyram analyte, while at λ ex = 290 nm, the highest fluorescence quenching was achieved by the imidacloprid analyte. [ABSTRACT FROM AUTHOR]

A new 1D coordination polymer [Pb(adba)(DMF)] n exhibits the competitive sensitivity, detection limit and radiation stability responsive to X-ray and could serve as a promising scintillating material candidate for X-ray detection in highly irradiating conditions. [Display omitted] • A new X-ray responsive 1D coordination polymer [Pb(adba)(DMF)] n (named as Pb-adba , H 2 adba = 4,4′-(9,10-anthracenediyl)dibenzoic acid, DMF = N , N -dimethylformamide) was constructed with Pb(II) salt and H 2 adba by a mild solvothermal process. • Pb-adba exhibits the competitive sensitivity and detection limit toward X-ray than classical scintillators PbWO 4 (PWO), anthracene and some reported SMOFs. • Pb-adba possess favorable radiation stability at the dose rate of 42.29 mGy/s for 3 h (equivalent to the cumulative dose of 456 Gy). The strong X-ray attenuation and beneficial optoelectronic properties of lead(II)-based coordination polymers (CPs) materials have aroused great interest in the field of radiation detection. In this work, a X-ray responsive scintillating 1D Pb(II)-CP [Pb(adba)(DMF)] n (named as Pb-adba , H 2 adba = 4,4′-(9,10-anthracenediyl)dibenzoic acid, DMF = N , N -dimethylformamide) with favourable irradiation stability was synthesized by the self-assembly approach, which exhibits competitive sensitivity and detection limit toward X-ray than classical scintillators PbWO 4 (PWO), anthracene and some reported SMOFs. [ABSTRACT FROM AUTHOR]

[Display omitted] Four new Zn(II)-, Cd(II)-, Mn(II)-, and Co(II) - based 1D to 2D coordination polymers (CPs) were synthesized from metal salts and 1,4-di(1-imidazol-1-yl)naphthalene (DIN) ligand via the coordination reaction under hydrothermal conditions with quantitative yields, namely, [Zn(SO 4)(DIN)(H 2 O)] (CP-1), [Cd(NO 3) 2 (DIN)] (CP-2), [Mn(SO 4)(DIN)(H 2 O) 3 ] (CP-3), and [Co(NO 3) 2 (DIN) 2 (H 2 O) 4 ] (CP-4). The CPs were analyzed and characterized using FT-IR, Elemental Analysis, TGA, SC-XRD, and PXRD. CP-1 was selected as a model sensor for fluorescence detection, and the sensor exhibited high quenching rates at two excitation wavelengths of λ ex = 230 and 290 nm, and at a single emission wavelength of λ em = 350 nm. At these two different excitation wavelengths, CP-1 behaved differently during the sensing of pesticides, and the highest quenching rate was achieved by the sensor for nitenpyram (λ ex = 230 nm) and imidacloprid (λ ex = 290 nm). Furthermore, during the sensing of vitamins, CP-1 encountered a strong quenching effect toward vitamin B2. During the sensing processes, the inner filter effect (for nitenpyram, imidacloprid, and vitamin B2), fluorescence resonance energy transfer (for nitenpyram, imidacloprid, and vitamin B2), and photo-induced electron transfer (for vitamin B2) were the mechanisms responsible for fluorescence quenching. [ABSTRACT FROM AUTHOR]

• Two new coodination polymers (CPs) with 2D synthesized and characterized. • It is interesting to notice that BAO28 demonstrated sensitive sensing of VB2, nitenpyram (NTP), and imidacloprid (IMI) with a low detection limit. Two new 2D Zn(II) coordination polymers (BAO28 and BAO29), formulated as [Zn(DIN)(HPT)]DMF·2H 2 O (BAO28) and [Zn(DIN)(HPT)]·2H 2 O (BAO29) (H 2 HPT = 5‑hydroxy- iso phthalic acid, DIN = 1,4-di(imidazol-1-yl)naphthalene and DMF = N,N -dimethylformamide), were successfully synthesized under solvothermal conditions. Fluorescence analysis showed that BAO28 proceeded with a DIN ligand-based emissive fluorescence. More importantly, the recoverable multi-responsive fluorescent sensor BAO28 was used for fluorescent detection of imidacloprid (IMI), nitenpyram (NTP), and riboflavine (VB2) in a neutral buffer solution with high sensitivity and a low detection limit. Moreover, the sensing of the pesticides by BAO28 was mainly due to the competitive absorption of excitation and emission light by the sensor with that of the pesticides. Furthermore, for the sensing of riboflavine, in addition to the internal filtration effect (IFE) and fluorescence resonance energy transfer (FRET) mechanisms, the sensing mechanism was simultaneously attributed to photoinduced electron transfer. [Display omitted] [ABSTRACT FROM AUTHOR]

Hydrothermal reaction of rare earth oxides with 1H-benzimidazole-5,6-dicarboxylic acid (H 3 bidc) and MnSO 4 ·H 2 O afforded a series of new three-dimensional (3D) coordination polymers, namely, [Ln 2 Mn(Hbidc) 2 (SO 4 ) 2 ·8H 2 O] n (Ln = Sm ( 1 ), Eu ( 2 ), Tb ( 3 ), Dy ( 4 ) and Ho ( 5 )) and [Gd 2 Mn(Hbidc) 2 (SO 4 ) 2 ·7H 2 O] n ( 6 ). Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, FT-IR, powder X-ray diffraction and thermogravimetric analyses (TGA). The single-crystal X-ray diffraction analysis reveals that coordination polymers 1 – 6 have similar 3D frameworks fabricated through Hbidc 2 − and SO 4 2 − bridging dinuclear lanthanide secondary building units. Moreover, the photoluminescence of complexes 1 – 4 and magnetism of complexes 4 and 6 have been investigated, 4 exhibits remarkably slow magnetic relaxation behavior with the energy barrier Δ E / k B = 83.3 K. [ABSTRACT FROM AUTHOR]

The hydrothermal reaction of Ln(NO3)3·6H2O, 3-(4-carboxyphenyl)-2,6-pyridinedicarboxylic acid (H3cppdc) and N,N-dimethylformamide (DMF) gave a series of lanthanide coordination polymers n[NH2(CH3)2]·[Ln(cppc)2(H2O)2]n (where: Ln=Ce (1), Pr (2), Nd (3), Sm (4), Eu (5), Gd (6), Tb (7), Dy (8), Ho (9) and Er (10); and H2cppc=5-(4-carboxyphenyl)-2-pyridinecarboxylic acid). The H2cppc ligand was formed in situ via decarboxylation of the initial H3cppdc ligand under the hydrothermal reaction conditions. Complexes 1-10 that crystallized in the same C2/c space group, exhibited similar 2D layered structures and assemble into 3D supramolecular networks via hydrogen bonding and π-π stacking interactions. In addition, the luminescence properties of complexes 4, 5, 7 and 8 were investigated. [ABSTRACT FROM AUTHOR]