Two New Cu(II) Coordination Polymers with 2D and 1D Frameworks that Show Reversible Structural Transformations Depending on the Present Solvents

Two new CuII coordination polymers with bis-imidazole ligand, bitrb, were synthesized and characterized. Reaction of CuSO4·5H2O with bitrb in a MeOH-H2O mixed solution produced a 2D coordination polymer, while a similar reaction in a THF-MeOH mixed solution gave a 1D coordination polymer. The former compound converts to the latter in a THF-MeOH mixed solvent, while the reversed reaction proceeds in MeOH-H2O media. Their crystal structures and the reversible transformations depending on the present solvents are described. Reaction of CuSO4·5H2O with bis-imidazole ligand, bitrb, in a MeOH-H2O mixed solution produced a 2D coordination polymer, while similar reaction in a THF-MeOH mixed solution gave a 1D coordination polymer. The former compound transforms to the latter in a THF-MeOH mixed solvent, while the reversed reaction proceeds in MeOH-H2O media. Their crystal structures and the reversible tranformations depending on the present solvents are described.