Synthesis, characterization and crystal structure of a new β-octamolybdate-supported compound: [Ni(H2O)(2, 2′- bipy)2]2[Mo8O26] · 4H2O · 2CH3COOH

A new β-octamolybdate-supported compound: [Ni(H2O)(2,2′-bipy)2]2[ β-Mo8O26] · 4H2O · 2CH3COOH was synthesized by reaction of Na2MoO4 · 2H2O, NiCl2 · 6H2O 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 Ni2+ cations with distorted octahedral configurations are combined by a β-[Mo8O26]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-[Mo8O26]4− anion.