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Molecular Structure of N-Methylbis (2-Hydroxyethyl)Ammonium hexafluorosilicate at 100 and 298 K |
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| Authors: | M G Voronkov A A Korlyukov V S Fundamenskii ÉA Zels’bst M Yu Antipin |
| Institution: | 1. A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Division, Russian Academy of Sciences, Moscow, Russia 2. A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia 3. East Siberian State Academy of Education, Irkutsk, Russia |
| Abstract: | Two polymorphic modifications of N-methylbis(2-hydroxyethyl)ammonium hexafluorosilicate (AHFS) crystallize in monoclinic symmetry. The independent part of the unit cell of the low temperature modification contains two cations and an anion. The cell volume is two times smaller in the high temperature modification, the SiF6]2- anion being disordered. In both modifications of methylbis(2-hydroxyethyl)ammonium hexafluorosilicate (HOCH2CH2)2HN+SiF6]2-, the SiF6]2- anion and the (HOCH2CH2)2HN+CH3 cation are linked by F…H—O hydrogen bonds. The silicon atom polyhedron in the anion is a tetragonal bipyramid; the coordination polyhedron of the nitrogen atom in the cation is a tetrahedron. |
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