Syntheses, Structures, and Luminescence of Metal(II) Coordination Polymers based on Flexible 1,1 '-(1,4-Butanediyl)bis(imidazole) and Tetrachlorobenzene-1,4-dicarboxylate Ligands

摘要

The coordination polymers, {[Co(bbim)(2)(H2O)(2)](tcbdc)center dot 2H(2)O}(n) (1), {[Ni(tcbdc)(bbim)(H2O)(2)]center dot 2DMF}(n) (2), and {[Cu-2(tcbdc)(2)(bbim)(4)]center dot 4H(2)O}(n) (3) [bbim = 1,1'-(1,4-butanediyl)bis(imidazole) and tcbdc(2-) = tetrachlorobenzene-1,4-dicarboxylate] were synthesized and characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis, luminescence, and single-crystal X-ray diffraction analysis. Complex 1 has a double-stranded chain structure through doubly bridged [Co(bbim)(2)] units. Complex 2 exhibits two-dimensional square grid, whereas complex 3 has a three-dimensional porous network structure with an unprecedented 4(4).6(11) topological structure through interpenetrating square grid. The water molecules in complex 3 occupy the vacancy through three kinds of hydrogen bond interactions. Upon excitation at 370 nm, complexes 1-3 present solid-state luminescence at room temperature.