Quadrupole resonance studies of hydrogen bonding in alkylammonium halides under high pressure
- 1 January 1978
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 74, 994-1004
- https://doi.org/10.1039/f29787400994
Abstract
The temperature and pressure dependence of the 79Br and 127I quadrupole resonance frequencies have been studied in the salts [MeNH3]+Br–, [MeNH3]+I–, [EtNH3]+Br–, and [EtNH3]+I–, and their N-deuterated derivatives. The observed pressure coefficients of the quadrupole coupling constant can be large, as much as 11 kHz (MPa)–1 for 127I resonance in [MeNH3]+I–. The effects of rise in temperature and deuteration are explained mainly in terms of an anisotropic expansion of the hydrogen bonds between the cation and the bromide or iodide ions; pressure appears both to compress the hydrogen bonds and to change their angular configuration at the halide ion.Keywords
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