I. A. Oxton, O. Knop, M. Falk
Mar 15, 1976
Citations
0
Influential Citations
21
Citations
Journal
Canadian Journal of Chemistry
Abstract
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.