Spectroscopic studies of salts of 4-methyl-benzenesulfonic acid II. The spectrum of the ammonium ions in ammonium 4-methyl-benzenesulfonate

Add time:08/20/2019    Source:sciencedirect.com

Two bands of unequal intensity and half-width are found in the OD stretching region of the room-temperature spectra of slightly deuterated ammonium 4-methyl-benzenesulfonate. The bond at higher frequencies is broader and more intense than that having a lower frequency value. Such a spectral picture suggests an effective symmetry of the NH3D+ ions not much different from the ideal C3v one, despite the fact that the site symmetry of the ammonium ions in the structure is only C1. Within each NH3D+ ion, the proton participating in the formation of the strongest hydrogen bond seems to be unique, whereas the remaining three are essentially equivalent, perhaps because of the rapid reorientation of the ions in the structure. The spectroscopic picture is not consistent with the published crystallographic data.An ammonium ion librational band is found in the low-temperature spectra (around 430 cm−1).

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