Low temperature powder diffraction and DFT solid state computational study of hydrogen bonding in NH4VO3

Autor: Yaroslav Filinchuk, Lubomir Smrcok, B. Bitschnau
Rok vydání: 2009
Předmět:
Zdroj: Crystal Research and Technology. 44:978-984
ISSN: 1521-4079
0232-1300
DOI: 10.1002/crat.200900339
Popis: The crystal structure of NH4VO3 was refined by the geometry optimization done by total energy minimization in solid state using DFT/plane waves approach. The lattice parameters were derived by the Le Bail technique from the low temperature X-ray (40-293 K) and synchrotron (100-293 K) powder diffraction data. The structure is formed by the infinite chains of irregular VO4 tetrahedra running approximately parallel to the caxis, which are interlinked by the ammonium ions placed between them. The ammonium ions link to the [VO4]∞ chains through one linear, one bifurcated and two trifurcated N-HO hydrogen bonds. Considering their stability there are six distinct N-HO hydrogen bonds: two strong with the N-HO bond angles close to the straight, two medium with the bond angles of 123° and 148° and two very bent (105° and 107°) and hence weak hydrogen bonds. There is a reasonable agreement between the energies of the stretching ν(NH) modes estimated using the optimised NO contact distances and those obtained experimentally. © 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Databáze: OpenAIRE
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