Synthesis, characterization and crystal structure of a new β-octamolybdate-supported compound: [Ni(H 2O)(2, 2′- bipy) 2] 2[Mo 8O 26] · 4H 2O · 2CH 3COOH

Abstract

A new β-octamolybdate-supported compound: [Ni(H 2O)(2,2′-bipy) 2] 2[ β-Mo 8O 26] · 4H 2O · 2CH 3COOH was synthesized by reaction of Na 2MoO 4 · 2H 2O, NiCl 2 · 6H 2O with 2,2′-bipyridine employing a conventional method and structurally characterized by IR, UV spectra, thermogravimetry and differential thermal analysis (TG–DTA) and X-ray diffraction. In the title compound, the two six-coordinated Ni 2+ cations with distorted octahedral configurations are combined by a β-[Mo 8O 26] 4− isopolyanion through two terminal oxygen atoms from the framework of the isopolyanion. It is particularly interesting that the title compound exists in a very “molecular” manner and not as an extended one-dimension chain, two-dimension layer or three-dimension structure unlike many of below-mentioned organic–inorganic compounds containing β-[Mo 8O 26] 4− anion.