Construction of a New Two-fold Interpenetrated Three-dimensional Cobalt(II) Coordination Polymer Based on 2,5-Thiophenedicarboxylic Acid and Bis(imidazol-1-yl)methane

A cobalt coordination polymer, {[Co-2(tdc)(2)(bimm)(2)]center dot(3DMF)}(n), was synthesized based on 2,5-thiophenedicarboxylic acid (H(2)tdc) and bis(imidazol-1-yl)methane (bimm) mixed ligands. The asymmetric unit of the complex contains two Co2+ cations, two tdc(2-) dianions, two neutral bimm ligands, and three free DMF molecules. In the complex, deprotonated tdc(2-) dianions alternately bridge the adjacent Co2+ cations to generate chains, which are further connected by the flexible bimm ligands to form a 3D structure containing adamantanoid-like subunits. In topology, the structure of 1 represents a 4-connected uninodal two-fold interpenetrated dia (6(6)) topology. Moreover, the solid UV-Vis absorption spectra of the complex have also been investigated.