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

Abstract

The coordination polymers, {[Co(bbim) 2 (H 2 O) 2 ](tcbdc)· 2H 2 O} n (1), {[Ni(tcbdc)(bbim)(H 2 O) 2 ]·2DMF} n (2), and {[Cu 2 (tcbdc) 2 (bbim) 4 ]·4H 2 O} n (3) [bbim = 1,1Ј-(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 1486 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.