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Fermi resonance and solvent dependence of the CO moiety of 4‐(dimethylamino) benzaldehyde
Author(s) -
Seehra Jasmeet K.,
Jagodzinski Paul W.
Publication year - 1990
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.1250210107
Subject(s) - benzaldehyde , fermi resonance , chemistry , acceptor , solvent , moiety , raman spectroscopy , photochemistry , electron acceptor , resonance (particle physics) , molecule , oxygen , analytical chemistry (journal) , organic chemistry , catalysis , physics , optics , condensed matter physics , particle physics
The Raman spectra of 4‐(dimethylamino)benzaldehyde in the 1550–1750 cm −1 region in seventeen solvents and as a molten liquid were measured. In all cases a multicomponent band was observed in the CO stretching region and these components were analyzed by the solvent variation method for Fermi resonance interactions. Unperturbed vibrational frequencies were calculated, and the frequencies attributed to ν(CO) were plotted against the solvent electron acceptor, number. A dual‐trace plot was observed. These traces were attributed to extrinsic interactions involving both the carbonyl oxygen and the aldehydic hydrogen in solvents of low acceptor number and predominantly the carbonyl oxygen in solvents of high acceptor number. The spectrum of molten 4‐(dimethylamino)benzaldehyde was used to predict an acceptor number of 14 for this molecule. This value was used to differentiate between high and low acceptor numbers for the solvents used in this study.