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A complex [Ni(meophtpy)2](ClO4)2⋅2H2O (1) (meophtpy = 4'-(4-methoxyphenyl)-2,2':6',2"-terpyridine) has been synthesized and characterized by IR, element analysis, TGA and single crystal X-ray diffraction. The complex crystallizes in Tetragonal system with space group I41/a, a = 24.470(4), b = 24.470(4), c = 13.845(5)Å, V = 8290.12 ų, Dc = 1.558 g/cm³, Z = 8, F(000) = 4016, final GOF = 1.021, R1 = 0.0619, and wR2 = 0.1261 for 3616 observed reflections with I >2δ(I). The crystal structure analysis shows that a three dimensional network overlapped with terpyridine motifs was formed by hydrogen bonds and π-π interactions which are seldom found in terpyridine complexes. Themagnetic property of 1 has also been investigated. [ABSTRACT FROM AUTHOR]

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]

The bifunctional pyridine-2,3-dicarboxylic acid (H2pdc) ligand has one N atom and four O atoms, which could bind more than one AgI centre with diverse binding modes. A novel infinite one-dimensional AgI coordination polymer, namely catena-poly[[silver(I)-(μ2-pyridine-2,3-dicarboxylato-κ2 N: O3)-silver(I)-tris(μ2-5-methyl-1,3,4-thiodiazol-2-amine-κ2 N: N′)] monohydrate ethanol monosolvate], {[Ag2(C7H3NO4)(C3H5N3S)3]·H2O·C2H5OH} n, has been synthesized using H2pdc and 5-methyl-1,3,4-thiadiazol-2-amine (tda), and characterized by single-crystal X-ray diffraction. One AgI atom is located in a four-coordinated AgN4 tetrahedral geometry and the other AgI atom is in a tetrahedral AgN3O geometry. A dinuclear AgI cluster formed by three tda ligands with a paddelwheel configuration is bridged by the dianionic pdc2− ligand into a one-dimensional coordination polymer. Interchain N-H...O hydrogen bonds extend the one-dimensional chains into an undulating two-dimensional sheet. The sheets are further packed into a three-dimensional supramolecular framework by interchain N-H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

A silver complex, Ag(L)(2,2'-bpy)(H2O) 2 (1), has been synthesized with 3-(benzoimidazol-2-yl)propanoic acid (HL) and 2,2'-bipyridine (2,2'-bpy) and characterized by IR, elemental analysis, TGA, and single-crystal X-ray diffraction. The complex crystallizes in monoclinic system with space group P2(1)/c, a = 10.6088(4), b = 12.3566(3), c = 15.3319(5) Å, β = 101.668(4)°, V = 1968.31(11) ų, Dc = 1.634 g/cm³, Z = 4, F(000) = 972, final GOF = 1.058, R = 0.0334, and wR = 0.0895 for 3469 observed reflections with I > 2σ(I). The crystal structure analysis shows that a three dimensional network was formed by hydrogen bonds and π-π interactions. The fluorescence property of 1 has been investigated. [ABSTRACT FROM AUTHOR]

The design and synthesis of functional coordination polymers is motivated not only by their structural beauty but also by their potential applications. ZnII and CdII coordination polymers are promising candidates for producing photoactive materials because these d10 metal ions not only possess a variety of coordination numbers and geometries, but also exhibit luminescence properties when bound to functional ligands. It is difficult to predict the final structure of such polymers because the assembly process is influenced by many subtle factors. Bis(imidazol-1-yl)-substituted alkane/benzene molecules are good bridging ligands because their flexibility allows them to bend and rotate when they coordinate to metal centres. Two new ZnII and CdII coordination polymers based on mixed ligands, namely, poly[[μ2-1,4-bis(imidazol-1-ylmethyl)benzene-κ2 N3: N3′]bis(μ3-2,2-dimethylbutanoato-κ3 O1: O4: O4′)dizinc(II)], [Zn2(C6H8O4)2(C14H14N4)] n, and poly[[μ2-1,4-bis(imidazol-1-ylmethyl)benzene-κ2 N3: N3′]bis(μ3-2,2-dimethylbutanoato-κ5 O1, O1′: O4, O4′: O4)dicadmium(II)], [Cd2(C6H8O4)2(C14H14N4)] n, have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy and thermogravimetric analysis. Both complexes crystallize in the monoclinic space group C2/ c with similar unit-cell parameters and feature two-dimensional structures formed by the interconnection of S-shaped Zn(Cd)-2,2-dimethylsuccinate chains with 1,4-bis(imidazol-1-ylmethyl)benzene bridges. However, the CdII and ZnII centres have different coordination numbers and the 2,2-dimethylsuccinate ligands display different coordination modes. Both complexes exhibit a blue photoluminescence in the solid state at room temperature. [ABSTRACT FROM AUTHOR]

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]

The design and preparation of crystalline polymeric materials has attracted increasing attention due to their diverse applications as functional materials in gas storage, separation, catalysis, sensing and photoluminescence. The judicious selection of organic linkers is critical for varying the coordination behaviour of the metal ions and determining the overall characteristics of the networks. A new adenine-based ZnII coordination polymer, [Zn(C6H2O4S)(C5H5N5)] n or [Zn(tdc)(9H-ade)] (H2tdc is thiophene-2,5-dicarboxylic acid and ade is adenine), has been prepared hydrothermally and the crystal structure exhibits in its packing two-dimensional (4,4) grid sheets parallel to the ab plane, featuring two distinct square cavities delimited by the two types of ligands and the ZnII ions with the dimensions 6.6 × 6.6 and 10.2 × 10.2 Å (based on the Zn...Zn distance). The title complex shows enhanced photoluminescence at 378 nm compared to the free ligands, suggesting that the coordination of H2tdc or adenine to the metal centre effectively increases the rigidity of the ligands and reduces the energy loss by radiative decay of intraligand excited states. [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]

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]

The solvothermal reaction of CuCl 2 ·2H 2 O, 5-(isonicotinamido)isophthalic acid (H 2 INAIP) results in the formation of a porous coordination polymer [Cu(INAIP)]·DMA·H 2 O ( 1 ) in N,N′-dimethylacetamide. X-ray single-crystal structure analysis reveals that it is a three-dimensional non-interpenetrated pillar–layer framework with a (3,6)-connected rutile ( rtl ) topology. Moreover, complex 1 displays selective adsorption behavior of CO 2 over N 2 and catalytic property for Knoevenagel condensation. [ABSTRACT FROM AUTHOR]