Synthesis, crystal structures and properties of three coordination polymers based on semi-rigid bis(benzimidazole-1-ylmethyl)biphenyl ligand

Abstract

Solvothermal reactions of three metal salts with a linear semi-rigid ligand 4,4′-bis(benzimidazol-1-ylmethy1)biphenyl) (bbmb) and terephthalic acid (H2TA), lead to three metal–organic coordination polymers, namely, {[Co(bbmb)(TA)] 4H2O} 1, [Zn2(bbmb)2(TA)(NO2)2] 2 and [Cd(bbmb)(TA)(H2O)] 3. Single-crystal X-ray diffraction analyses reveal that compound 1 exhibits a zigzag-shaped 1-D chain, which extended into a three-dimensional supermolecular framework through π-π interactions, compound 2 exhibits a thick two-dimensional sheet, while compound 3 exhibits a unique 3D two-fold interpenetrated network of irl topology. Moreover, IR spectroscopy, powder X-ray diffraction, thermogravimetric analyses, and the properties of the three compounds were studied.