Coordination polymers (NiII and CoII) based on the rigid bridging ligand, 4,4′-bis(imidazol-1-yl)biphenyl, with (46) topology

Abstract

Two coordination polymers, {[Ni0.5(4,4′-bib)Cl][(4,4′-bib)0.5]·H2O} n (1) and {[Co(4,4′-bib)3(H2O)2][NO3]2·H2O} n (2) (4,4′-bib = 4,4′-bis(imidazol-1-yl)biphenyl) have been hydrothermally synthesized. Their structures have been determined by single-crystal X-ray diffraction analyses and are further characterized by elemental analyses, IR, thermogravimetric analyses, and powder X-ray diffraction. In 1, each NiII is linked by four μ 2–4,4′-bib ligands in 2-D (4,4)-networks, which are further connected through host–guest interaction to form a 3-D packing diagram with 1-D channels. In 2, each CoII is linked by two μ 2–4,4′-bib and two μ 1–4,4′-bib ligands in a 1-D zigzag chain, further connected through non-covalent interactions (including O–HN, O–HO, C–Hπ, and ππ interactions) to form a 3-D supramolecular structure. 4,4′-bib exhibits μ 2-, μ 1-, and μ 0-coordination during the construction of 1 and 2. From the topological view, the overall structures of 1 and 2 possess (46) topology.