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Crossing of Anisotropic and Isotropic Raman Components in the Intermolecular Resonance Coupling of Vibrations. IV—Methanol Solutions in Acetone
Author(s) -
Kecki Zbigniew,
Sokołowska Anna
Publication year - 1996
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/(sici)1097-4555(199605)27:5<429::aid-jrs981>3.0.co;2-o
Subject(s) - acetone , raman spectroscopy , intermolecular force , dilution , chemistry , methanol , isotropy , anisotropy , resonance (particle physics) , analytical chemistry (journal) , atomic physics , thermodynamics , organic chemistry , molecule , optics , physics
Changes in the wavenumbers of the anisotropic and isotropic components of the O–H and C–O stretching bands of methanol in the Raman spectrum of methanolic solutions in acetone were investigated. Non‐coincidence values (defined as Δν=ν aniso ‐ν iso ) in the case of the O–H band changed with dilution by acetone from +85 cm −1 in pure methanol to ‐26 cm −1 in the most dilute solution, whereas the negative non‐coincidence ‐5 cm −1 of the C–O band of methanol remained almost unchanged with dilution by acetone. The unusual behaviour of the methanolic vibrations was explained by a third‐body mediation mechanism.