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Two complexes [Ag(bpy)(H2O)]·(Hbac) (1) and [Ag2(bpy)2(H2O)2](pdc)·(H2O)5(2) (H2bac = benzilic acid, bpy = 4,4′-bypyridine, H2pdc = 2,6-pyridinedicarboxylic acid) have been synthesized and characterized by IR, element analysis, X-ray-single crystal diffraction and TGA. Crystal data for1: Monoclinic, space group C2/c,a= 18.8192(5) Å,b= 12.7131(5) Å,c= 17.8373(8) Å, β = 95.745(4)°,V= 4246.1(3) Å3andZ= 8;2: Triclinic, space group, P-1,a= 8.132(5) Å,b= 10.485(6) Å,c= 18.026(10) Å, α = 96.194(10)°, β = 91.047(11)°, γ = 105.866(10)°,V= 1468.0(15) Å3andZ= 2. In complex1, Ag(I) is coordinated by two discrete 4,4′-bpy ligands and one water molecule and Hbac−behaves as a counterpart anion. In the crystal, a 3D network was formed by hydrogen bonds and π–π face-to-face interactions. In complex2, Ag(I) is also coordinated by two discrete 4,4′-bpy ligands and one water molecule and pdc2−behaves as a counterpart anion, too. In the crystal, a similar 3D network was formed by hydrogen bonds and π–π face-to-face interactions as well as that of complex 1. The luminescence properties of 1 and 2 have been investigated. [ABSTRACT FROM PUBLISHER]

From the viewpoint of crystal engineering, the construction of crystalline polymeric materials requires a rational choice of organic bridging ligands for the self-assembly process. Multicarboxylate ligands are of particular interest due to their strong coordination activity towards metal ions, as well as their various coordination modes and versatile conformations. The structural chemistry of dicarboxylate-based coordination polymers of transition metals has been developed through the grafting of N-containing organic linkers into carboxylate-bridged transition metal networks. A new luminescent two-dimensional zinc(II) coordination polymer containing bridging 2,2-dimethylsuccinate and 4,4′-bipyridine ligands, namely poly[[aqua(μ2-4,4′-bipyridine-κ2 N: N′)bis(μ3-2,2-dimethylbutanedioato)-κ4 O1, O1′: O4: O4′;κ5 O1: O1, O4: O4, O4′-dizinc(II)] dihydrate], {[Zn2(C6H8O4)2(C10H8N2)(H2O)]·2H2O} n, has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction and elemental, IR and thermogravimetric analyses. In the structure, the 2,2-dimethylsuccinate ligands link linear tetranuclear ZnII subunits into one-dimensional chains along the c axis. 4,4′-Bipyridine acts as a tethering ligand expanding these one-dimensional chains into a two-dimensional layered structure. Hydrogen-bonding interactions between the water molecules (both coordinated and free) and carboxylate O atoms strengthen the packing of the layers. Furthermore, the luminescence properties of the complex were investigated. The compound exhibits a blue photoluminescence in the solid state at room temperature and may be a good candidate for potential hybrid inorganic-organic photoactive materials. [ABSTRACT FROM AUTHOR]

Four terpyridine coordination complexes, [Zn(meophtpy)2]·(ClO4)2·(H2O) (1), [Cd(meophtpy)2]·(ClO4)2(2), [Zn(nh2phtpy)2]·(ClO4)2(3), and [Cd(nh2phtpy)2]·(ClO4)2(4) (meophtpy = 4′-(p-methoxylphenyl)-2,2′:6′,2″-terpyridine, nh2phtpy = 4′-aminophenyl-2,2′:6′,2″-terpyridine), were synthesized using the solvothermal method. These complexes have been characterized by IR spectra, elemental analyses, and X-ray diffraction. In all these complexes, the metal ions are coordinated by six nitrogens from two terpyridines. 3-D networks have been constructed by hydrogen bonds and π–π interactions. The luminescence of these four complexes has been investigated in the solid state at room temperature. Four Zn(II) and Cd(II) complexes with two kinds of terpyridines have been synthesized and characterized. All these complexes are six N coordinated with two terpyridines. 3-D networks have been formed with hydrogen bonds and π–π interactions. The luminescence properties have been studied and all these ligands and complexes can be used as luminescence materials. [ABSTRACT FROM AUTHOR]

Six novel coordination polymers with fascinating 2D/3D architectures based on 4'-(4-(1H-imidazol-1-yl)phenyl)-4,2':6',4''-terpyridine, different polycarboxylates, and metal ions have been prepared under solvothermal conditions, and the photoluminescent behaviors for the complexes 1-6 have been investigated. [Display omitted] • Six novel coordination polymers have been prepared under solvothermal conditions. • Three complexes with 2D and the other three showing 3D network have been found. • The luminescent properties for complexes 1 – 6 have been investigated. Six novel coordination polymers (CPs) based on a rigid tridentate ligand, 4′-(4-(imidazol-1-yl)phenyl)-4,2′:6′,4′'-terpyridine (imphtpy), namely {[Zn 2 (imphtpy) 2 (p -bdc) 2 ]·(H 2 O)} n (1), [Zn(imphtpy)(m -bdc)] n (2), {[Zn(imphtpy)(qda) 1.5 ]·(H 2 O)} n (3), [Cd 2 (imphtpy) 2 (m -bdc) 2 ] n (4), [Cd(imphtpy)(abtc) 0.5 ] n (5) and [Cd(imphtpy)(qda)] n (6), (p -H 2 bdc = 1,4-benzenedicarboxylic acid, m -H 2 bdc = 1,3-benzenedicarboxylic acid, H 2 qda = hydroquinone-o,o'-diacetic acid and H 4 abtc = 3,3′,5,5′-azobenzenetetracarboxylic acid), have been solvothermally synthesized and characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD), thermogravimetric (TG) analysis and single-crystal X-ray diffraction. Complex 1 displays a pseudo four-fold interpenetration of dia network in a [2 + 2] mode. Complex 2 exhibits a 2D → 2D polycatenane of two-fold interpenetrated network with the sql topology. Complex 3 shows a interdigitated 2D layer with the sql topology, which is further extended into a 3D supramolecular framework through π-π interactions and hydrogen bonds. Complex 4 features a two-fold interpenetrated (4,4)-connected 3D + 3D → 3D framework with the bbf topology. Complex 5 reveals a 2D network constructed by binuclear Cd 2 (CO 2) 4 secondary building unit (SBU) with the sql topology which is further packed into a 3D supramolecular framework through π-π interactions. Complex 6 is a 3D network constructed by binuclear Cd 2 (CO 2) 2 O 2 SBU with the uninodal 6-c pcu topology. These results indicate that the versatile coordination networks of imphtpy and various polycarboxylate ligands play crucial roles in modulating the structural topologies of coordination networks. In addtion, photoluminescence properties have been explored for complexes 1 – 6 in the solid state at room temperature, which are derived from metal perturbed intraligand charge transfer (ICT) or ligand-to-ligand charge transfer. [ABSTRACT FROM AUTHOR]

The zinc(II) coordination polymer Zn2(L)2(bix)2·2H2O (1) [H2L = 4,4'-methylenebis(oxy)dibenzoic acid, bix = 1,4-bis(imidazole-1-yl-methylene)-benzene] was synthesized by hydrothermal reaction. The title compound was characterized by single-crystal X-ray diffraction analysis, IR spectroscopy, and elemental analysis. The crystal structure determination reveals that compound 1 displays a twofold interpenetrated 3D framework, in which the Zn atoms are connected by the H2L ligands into interesting right and left-handed helical chains. Topological analysis reveals that the title compound displays a (3,4)-connected (6³) (65·8) topology. The solid-state luminescent spectra was studied. Furthermore, the dispersed solution of compound 1 in DMF exhibits strong fluorescent emission, which could be quenched by trace amount of nitrobenzene. [ABSTRACT FROM AUTHOR]

• Six coordination polymers have been prepared under solvothermal conditions with a newly designed and synthesized ligand 4′-(4-(benzimidazol-1-yl)phenyl)−4,2′:6′,4′'-terpyridine (bimphtpy). • Various structures with 2D+2D→3D polycatenation (1 and 5), undulated 2D (2) or two-fold 2D→2D interpenetrated network (3) and uninterpenetrated 3D network (4 and 6) have been found. • The photoluminescence behaviors of complexes 1–6 have been investigated. • The activated complex 3 shows moderate CO 2 adsorption of 15.9 cm3 (STP)/g (0.7 mmol/g, 3.08 wt%). Six Zn(II)/Cd(II) coordination polymers (CPs), namely, {[Zn 2 (bimphtpy)(p -bdc) 1.5 (OH)]·(H 2 O) 0.5 } n (1), [Zn 2 (bimphtpy) 2 (tdc) 2 ] n (2), {[Zn(bimphtpy)(cpoa)]·4H 2 O} n (3), [Cd 2 (bimphtpy)(p -bdc) 2 (H 2 O)] n (4), {[Cd 2 (bimphtpy)(m -bdc) 2 (H 2 O) 2 ]·(H 2 O) 0.75 } n (5), and {[Cd(bimphtpy)(qda)]·H 2 O} n (6), constructed from N-heterocyclic ligand 4'-(4-(benzimidazol-1-yl)phenyl)-4,2':6',4''-terpyridine (bimphtpy) and five dicarboxylic acids, (p -H 2 bdc = 1,4-benzenedicarboxylic acid, H 2 tdc = 2,5-thiophenedicarboxylic acid, H 2 cpoa =4-carboxyphenoxyacetatic acid, m -H 2 bdc = 1,3-benzenedicarboxylic acid, H 2 qda = hydroquinone-o,o'-diacetic acid), have been solvothermally synthesized and structurally characterized mainly by single-crystal X-ray diffraction along with elemental analysis, IR spectroscopy, PXRD and TG analysis. Complex 1 exhibits a 2D + 2D → 3D polycatenated framework with bilayers showing the uninodal 5-c (4,4)Ia topology if Zn 2 (CO 2)(OH) SBU (secondary building unit) are considered. Complex 2 reveals a 2D → 2D polycatenane of two-fold interpenetrated network with rods threading loops showing 63- hcb topology. Complex 3 presents a highly undulated 2D 44- sql sheet with thickness of about 18.5 Å. Complex 4 displays a single 3D network constructed by binuclear Cd 2 (CO 2) 4 O 2 SBU showing the uninodal 6-c pcu topology. Complex 5 features a 2D + 2D → 3D polycatenated framework showing an unidentified topology with point symbol of {42·6·72·9}{42·6}{6·72}{64·8·10}. Complex 6 shows a single 3D network constructed by binuclear Cd 2 O 4 C 2 SBU with 8-c cds topology. Moreover, the fluorescent properties of complexes 1–6 in the solid state at room temperature as well as the adsorption properties of complex 3 are also investigated, suggesting their potential applications as luminescence materials and gas adsorption selectivity materials. Six novel coordination polymers with fascinating 2D/3D architectures based on a newly designed and synthesized N-heterocyclic ligand 4′-(4-(benzimidazol-1-yl)phenyl)-4,2′:6′,4′'-terpyridine (bimphtpy), along with different dicarboxylates, and Zn(II)/Cd(II) ions have been prepared under solvothermal conditions, and the photoluminescence behaviors of complexes 1–6 and the gas adsorption property of complex 3 have been investigated. [Display omitted] [ABSTRACT FROM AUTHOR]