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A zinc coordination polymer, Zn(IN)2 · 2H2O (1) (HIN = isonicotinic acid), has been synthesized and characterized by IR, elemental analysis, thermogravimetric analysis, and single crystal X-ray diffraction. This compound crystallizes in the chiral space group P62 with a = 15.512(3), b = 15.512(3), c = 6.262(2) Å, V = 1304.9(5) Å3, and Z = 3. The O and N atoms of the IN ligand are coordinated to a ZnII ion, locking the asymmetry of the IN ligand and transferring this asymmetry throughout the crystal structure to “direct” the formation of a chiral network. The structure of 1 is characteristic of a 3-D quartz-like framework, which contains hetero-chiral helical channels (pseudo-trigonal and hexagon channels) alternately along the c-axis. Compound 1 exhibits high stability and intense fluorescent emission at room temperature. [ABSTRACT FROM AUTHOR]

Three ZnII and CdII complexes with Y-shaped dicarboxylate ligands, namely [Zn(L1)(2,2′-bpy)2(H2O)] ·2H2O ( 1), [Zn(L1)(bpp)(H2O)] ( 2), and [Cd(L1)(H2O)] ·H2O ( 3) [H2L1 = N-phenyliminodiacetic acid, 2,2′-bpy = 2,2′-bipyridine, bpp = 1,3-bis(4-pyridyl)propane] were synthesized and characterized by elemental analysis, IR spectroscopy single-crystal X-ray diffraction, and thermogravimetric analyses. Compound 1 shows an hydrogen-bonded 2D network, whereas compound 2 is an infinite 1D wavy chain structure, though O-H ···O hydrogen-bonded to form a 2D network. Compound 3 displays a 2D uninodal 3-connected Shubnikov plane net with the point symbol of (4.82). Moreover, the solid-state such as thermal stabilities and fluorescence properties of 1- 3 were also investigated. [ABSTRACT FROM AUTHOR]

Two new coordination polymers, namely, [Zn(bdc)(mbix)] n ( 1) and {[Cd2(bdc)2(mbix)2] ·H2O} n ( 2) [H2bdc = 5-hydroxylisophthalic acid, mbix = 1,3-bis(imidazol-1-yl-methyl)benzene], were obtained under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, as well as powder- and single-crystal X-ray diffraction. Compound 1 exhibits a 2D puckered layer with (4,4) topology, which is further interconnected by hydrogen bonding interactions leading to a 3D supramolecular architecture. Compound 2 features a 5-connected 3D network with bnn (46.64) topology based on the dinuclear CdII subunits. In addition, solid-state properties such as thermal stabilities and photoluminescent properties of compounds 1 and 2 were also investigated. [ABSTRACT FROM AUTHOR]