CRYSTAL STRUCTURE AND NMR STUDY OF 4-AMINO-1,2,4-TRIAZOLIUM HEXAFLUORIDONIOBATE(V) AND HEXAFLUORIDOTANTALATE(V)
R. L. Davidovich1, A. A. Udovenko1, V. Ya. Kavun1, V. B. Logvinova1, V. V. Tkachev2
1Institute of Chemistry, Far Eastern 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, 4-амино-1,2,4-триазол, кристаллическая структура, ЯМР, спектры, niobium(V), tantalum(V), fluorine, 4-amino-1,2,4-triazole, crystal structure, NMR, spectra
Abstract
4-Amino-1,2,4-triazolium hexafluoridoniobate(V) and hexafluoridotantalate(V) (C2H5N4)MF6 (M = Nb, Ta) crystallizing in the monoclinic system (space group P 21/ n ) are synthesized for the first time and their crystal structures and spectroscopic features are studied by single crystal X-ray diffraction and 1H and 19F NMR spectroscopy. The crystal structures of isostructural (C2H5N4)MF6 compounds are formed of octahedral complex [MF6]- anions (M = Nb, Ta) and monoprotonated heterocyclic 4-amino-1,2,4-triazolium cations (C2H5N4)+ organized in a three-dimensional structure via N-H⋯F and N-H⋯N hydrogen bonds. The character and types of ion motions in the fluoride sublattice of (C2H5N4)MF6 are determined in a wide temperature range.
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