THE STRUCTURE OF A NEW OCTAHEDRAL FLUORIDE COMPLEX OF NIOBIUM (Me4N)2[Nb6F6Br6(H2O)2Cl4]в‹…6H2O
N. G. Naumov, S. Cordier, C. Perrin, S.B. Artemkina
Keywords: niobium, fluorides, cluster, synthesis, crystal structure
Pages: 1163-1166
Abstract
The substitution reaction of thiocyanide groups of the complex K4[Nb6F6Br6(NCS)6] in aqueous hydrochloric acid has afforded a new fluoride cluster anion [Nb6FBrCl(H2O)]2- isolated as the salt (Me4N)2[Nb6F6Br6Cl4(H2O)2]⋅6H2O (space group R3m, a = 11.230(5) Å, c = 26.230(5) Å, V = 2865(2) Å3, Z = 3, R1 = 0.0362, R2w = 0.0886). The anion contains the cluster core Nb6F6Br6 having ordered "inner" ligands. Difference in the atomic radii of "inner" ligands causes a significant distortion of the metal cluster along the three-fold axis.
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