One-Dimensional Coordination Polymers Based upon Bridging Terephthalate Ions

The reaction between transition metal halides MX2 (where M = Co(II) and Ni(II)) in an aqueous solution containing disodium terephthalate along with pyridine-based ligands gives rise to one-dimensional coordination polymers. Both [M(terephthalate)(4-picoline)2(H2O)2]·2(4-picoline) (1) and [M(terephthalate)(pyridine)2(H2O)2]·2(pyridine)·2(H2O) (2) have been isolated. These frameworks exhibit hydrogen bond donors running along the backbone of each polymer, which gives rise to inclusion chemistry between the framework and pyridine guest molecules.