Dynamic disorder of (CH 3) 4N + in (CH 3) 4NX (X = Cl, Br and I) as studied by Raman spectroscopy

Vibrational assignments of the observed bands in the Raman spectra of tetramethyl ammonium (TMA) halides at 300 and 100 K are proposed. The splitting of the C 4N totally symmetric mode ν 3( A 1) in the iodide is discussed in terms of a disordered structure. The temperature induced variations of inte...

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Bibliographic Details
Published in:Journal of molecular structure 1984-01, Vol.112 (3), p.309-316
Main Authors: Pal, Mahendra, Agarwal, A., Khandelwal, D.P., Bist, H.D.
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Molecular properties and interactions with photons
Photon interactions with molecules
Physics
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Summary:Vibrational assignments of the observed bands in the Raman spectra of tetramethyl ammonium (TMA) halides at 300 and 100 K are proposed. The splitting of the C 4N totally symmetric mode ν 3( A 1) in the iodide is discussed in terms of a disordered structure. The temperature induced variations of intensities of the components suggest occupation of two different sites which correspond to two different orientations of the TMA ion: parallel and perpendicular. Their energy difference is deduced to be 0.43 kcal mol −1. The relative behaviour of the three halides are explained if the tumbling motion is governed by the free space available in the lattice (in the order I − > Cl − > Br −).
ISSN:0022-2860
1872-8014
DOI:10.1016/0022-2860(84)85072-3