Two New Nickel, Cobalt Coordination Polymers Based on Flexible 1,3-bis((1H-imidazolyl)-methyl)benzene Ligand: Syntheses, Structures and Magnetic Properties

Two new coordination polymers, namely, [Ni(HIP)(m-bix)(H2O)]n (1), {[Co2(oba)2(m-bix)2]·H2O}n (2) (m-bix = 1,3-bis(1H-imidazolyl)-methyl)benzene, H2HIP = 5-hydroxyisophthalic acid, oba = 4,4-oxybisbenzoic acid), were synthesized under hydrothermal conditions by reactions of transition metal salts of Ni(OAc)2 and Co(OAc)2 with the N-heterocyclic m-bix. There structures were characterized by techniques of single-crystal X-ray diffraction analysis, elemental analysis, infrared spectra (IR) and thermogravimetric analysis (TGA). Complex 1 and 2 both exhibit a 2D 4-connected sql network with the topology symbol of (44·62) and are further extending into a 3D architecture via O–H⋅⋅⋅O hydrogen bonds. Moreover, the solid state magnetic properties of complex 1 and 2 have been investigated.