Hydrothermal Syntheses and Crystal Structures of Zn(II) and Co(II) Complexes Constructed from 5-Methoxyisophthalic Acid and 1,10-Phenanthroline Ligands

Two new one-dimensional coordination polymers, [Zn(L)(phen)](n) 1 and {[Co-2(L)(2)(phen)(2)]center dot 2H(2)O}(n)2 (H2L = 5-methoxyisophthalic acid, phen = 1,10-phenanthroline), have been obtained by hydrothermal conditions. According to their single-crystal X-ray diffraction analyses, complex 1 crystallizes in the monoclinic system, space group P2/c with a = 8.9195(11), b = 12.3620(15), c = 17.0211(18) angstrom, beta = 106.690(5)degrees, V = 1797.7(4) angstrom(3), the final R = 0.0298 and wR = 0.0715 for 3351 independent reflections with R-int = 0.0353. Complex 2 crystallizes in the monoclinic system, space group C2/c with a = 24.981(4), b = 11.1204(19), c = 18.125(3) angstrom, beta = 132.5620(10)degrees, V = 3708.5(11) angstrom(3), the final R = 0.0349 and wR = 0.0914 for 3424 independent reflections with R-int = 0.0214. Both 1 and 2 show L-bridged one-dimensional chain. 1 and 2 are further assembled by pi-pi and hydrogen bonding interactions into 2-D layer structures, and they also display 3-D supramolecular frameworks through their other hydrogen bonds. Zn(II) ion is five-coordinated with a distorted trigonal bipyramidal coordination geometry, while Co(II) ion is six-coordinated and resides in a distorted octahedral coordination geometry. Additionally, complex 1 shows fluorescence in the solid state at room temperature.