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Crossing of anisotropic and isotropic Raman components in the intermolecular resonance coupling of vibrations III‐Ca(ClO 4 ) 2 and benzene solutions in acetone
Author(s) -
Kęcki Zbigniew,
Sokolowska Anna
Publication year - 1995
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250261108
Subject(s) - raman spectroscopy , acetone , chemistry , benzene , intermolecular force , anisotropy , analytical chemistry (journal) , resonance (particle physics) , polar , molecule , atomic physics , organic chemistry , physics , optics , astronomy
Changes in the wavenumbers of the anisotropic and isotropic components of the C=O stretching band in the Raman spectrum of Ca(ClO 4 ) 2 and benzene solutions in acetone were investigated. Non‐coincidence values defined as Δ v = v aniso — v iso for the C = O band in Ca(ClO 4 ) 2 solutions were positive (+ 5 cm −1 ) for bulk acetone and negative (—25 cm −1 ) for acetone‐shared ion pairs. In acetone solutions diluted with benzene there is a decrease in C = O non‐coincidence from +5 cm −1 down to about — 1 cm −1 . The change of non‐coincidence sign appears at a benzene/acetone molar ratio of 10. The concept of third‐body mediation is applied to explain the observed changes of non‐coincidence in highly polar and non‐polar diluents.