CRYSTAL STRUCTURE OF TETRAMETHYLAMMONIUM HEXAFLUORIDONIOBATE(V) AND HEXAFLUORIDOTANTALATE(V)
A. A. Udovenko1, R. L. Davidovich1, V. B. Logvinova1, V. V. Tkachev2
1Institute of Chemistry, Far East Branch, Russian Academy of Sciences, Vladivostok, Russia
2Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, Russia
Keywords: ниобий(V), тантал(V), фтор, тетраметиламмоний, кристаллическая структура, niobium(V), tantalum(V), fluorine, tetramethylammonium, crystal structure
Abstract
Crystal structures of newly synthesized tetramethylammonium hexafluoridoniobate(V) and hexafluoridotantalate(V) (CH3)4N[МF6] (M=Nb, Ta) have been determined; they crystallize in the tetragonal crystal system, sp. gr. P 4/ nmm . Crystal structures of isostructural compounds (CH3)4N[МF6] (M=Nb, Ta) are formed by virtually regular tetrahedral tetramethylammonium cations (CH3)4N+ (NMe4, TMA) and octahedral complex anions [МF6]- (M=Nb, Ta), fluorine atoms of the equatorial plane are statistically disordered over two positions. Ionic interactions and weak hydrogen bonds C-H⋯F join the cations and the complex anions in a 3D assembly.
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