Spectroscopy, thermal and structural studies of new Zn II coordination polymer, [Zn 3(μ-bpa) 4.5(AcO) 3](ClO 4) 3·4.26H 2O

Abstract

Three Zn II coordination polymers with acetate and perchlorate anions, [Zn 3(μ-bpa) 4.5(AcO) 3](ClO 4) 3·4.26H 2O ( 1), [Zn 2(μ-bpe) 3(AcO) 2](ClO 4) 2 ( 2) and [Zn 2(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.