Some anhydrous hexahalogeno-complexes of quadrivalent protactinium

Abstract

Hexachloroprotactinates(IV), R₂PaCl₆(R = Cs, NMe₄, and NEt₄) have been prepared by reaction of the tetrachloride with the appropriate cation chloride in concentrated hydrochloric acid (R = Cs) or methyl cyanide (R = NMe₄ and NEt₄). Analogous hexabromoprotactinates(IV), R₂PaBr₆(R = NMe₄ and NEt₄) and the hexaiodo-complex (Ph₃MeAs)₂PaI₆ have also been prepared from the component halides in anhydrous methyl cyanide. Some chemical properties, infrared spectra, and X-ray powder diffraction results are reported for these compounds and compared with data for some analogous quadrivalent actinide complexes.