Infrared spectra of the ammonium ion in crystals. III. The ammonium ion in crystal sites of symmetry S4

Autor:	Michael L. Falk, Ian A. Oxton, Osvald Knop
Rok vydání:	1976
Předmět:	Organic Chemistry Inorganic chemistry Infrared spectroscopy General Chemistry Ammonium perrhenate Catalysis Spectral line Ion Crystal chemistry.chemical_compound Crystallography chemistry Ammonium Singlet state Crystallite
Zdroj:	Canadian Journal of Chemistry. 54:892-899
ISSN:	1480-3291 0008-4042
DOI:	10.1139/v76-129
Popis:	The infrared spectra of the isotopically isolated NH3D+ ion in polycrystalline ammonium perrhenate, NH4ReO4, and ammonium tetrachlorocuprate(II) dihydrate, (NH4)2.CuCl4.2H2O, have been recorded at room and liquid-nitrogen temperatures. In the crystals of both compounds the ammonium ions are located at sites of S4 symmetry. The N—D stretching mode of NH3D+ in NH4ReO4 is a singlet, as expected for this site symmetry. In (NH4)2.CuCl4.2H2O, however, a doublet is observed which reveals the occurrence of two non-equivalent orientations of the ammonium ion. The spectra of the undeuterated compounds contain bands due to combination modes involving the librations of the ammonium ion. This shows that the ions are non-rotating.
Databáze:	OpenAIRE
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