Synthesis, Crystal Structures, and Catalytic Properties of Silver(I) and Cobalt(II) Coordination Polymers Based on Flexible Bis(benzimidazole) with Pyridine-2, 6-Dicarboxylate

Two coordination polymers, [Ag2(pydca)(bbbi)2]n (1) and [Co2(pydca)2(bbbi)3]n center dot nH2O (2) [pydca = pyridine-2, 6-dicarboxylate, bbbi = 1, 1'-(1, 4-butylene)bis-1H-benzimidazole)] were hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, TG, PXRD, and single-crystal X-ray diffraction. Compound 1 features a one-dimensional helical chain structure bridged by bbbi ligand, and further assembled into a 2D supramolecular architecture through three kinds of intermolecular pp stacking interactions. Compound 2 displays an undulated 2D (6, 3) layer structure, in which each [Co(pydca)] unit is connected by three bbbi bridge ligands. Moreover, 1 and 2 have a remarkable activity for degradation of methyl orange in a photo-assisted Fenton-like process.