Self-assembly of three new metal organic coordination networks based on 1,2-bis(imidazol-1yl-methyl)benzene

Abstract

Three new metal organic coordination architectures from one-dimensional structures to three-dimensional frameworks, formulated as [Zn(mu-HCO2)(HCO2)(mu-o-bix)](n) (1), {[Cu(mu-o-bix)(2)(H2O)(2)]center dot 2HCO(2)}(n) (2) and {[Cd-2(mu(3)-siP)(2)(mu-o-bix)(2)Cd(mu-o-bix)(2)(H2O)(2)]center dot 5H(2)O) (3) (sip = 5-sulfoisophthalate), were synthesized using the flexible 1,2-bis(imidazole-1-ylmethyl)-benzene (o-bix) ligand in mixed-solvent media (solvothermal conditions) and characterized by single-crystal diffraction, Fr-IR and photoluminescence spectroscopy and thermogravimetric/differential thermal analysis. The X-ray crystallographic studies of 1 and 2 reveal 2D layer structures involving formate ions, which are generated in situ from the hydrolysis of DMF. Topological analysis results of the complexes show that 1 displays a honeycomb-like 6(3) layer and 2 has a hydrogen-bonded 2D structure with a 4-connected (4(4).6(2)) square lattice topology. Compound 3 exhibits a 3D 4,6-connected tcj/hc (4(2).5(2).6(2))(4(2).5(6).6(4).7(3)} net. In addition, the photoluminescence spectra of 1 and 3 show blue fluorescent emission bands; these emissions can probably be assigned to intraligand fluorescent emissions. (C) 2015 Elsevier Ltd. All rights reserved.