Spectroscopy, thermal and structural studies of new ZnII coordination polymer, [Zn3(μ-bpa)4.5(AcO)3](ClO4)3·4.26H2O

Three ZnII coordination polymers with acetate and perchlorate anions, [Zn3(μ-bpa)4.5(AcO)3](ClO4)3·4.26H2O (1), [Zn2(μ-bpe)3(AcO)2](ClO4)2 (2) and [Zn2(bpe)(AcO)4] (3), bpa = 1,2-bis(4-pyridyl)ethane and bpe = 1,2-bis(4-pyridyl)ethene, have been synthesized and characterized by elemental analysis, IR, 1H NMR, and 13C NMR spectroscopies, and the structure of compound 1 was determined by single-crystal X-ray diffraction. The thermal stabilities of compounds 1–3 were studied by thermal gravimetric (TG) and differential thermal analyses (DTA). The structural studies of compound 1 show that the structure may be considered as a three-dimensional coordination polymer of zinc(II) with large voids filled with disordered water molecules. The stability of the porous networks after removal of the guest water molecules is confirmed by X-ray powder diffraction.

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