Synthesis,characterization and crystal structure of a new beta-octamolybdate-supported compound:[Ni(H_2O)(2,2'- bipy)_2]_2[Mo_8O_(26)] centre dot 4H_2O centre dot 2CH_3COOH

摘要

A new beta-octamolybdate-supported compound:[Ni(H_2O)(2,2'-bipy)_2]_2[ beta-Mo_8O_(26)] centre dot 4H_2O centre dot 2CH_3COOH was synthesized by reaction of Na_2MoO_4 centre dot 2H_2O,NiCl_2 centre dot 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 beta-[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 beta-[Mo_8O_(26)]~(4-) anion.