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Pre‐resonance Raman effect of solid‐state phenothiazine
Author(s) -
de Faria D. L. A.,
Santos P. S.
Publication year - 1994
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.1250250704
Subject(s) - raman spectroscopy , resonance (particle physics) , solid state , crystal (programming language) , chemistry , phenothiazine , atomic orbital , excitation , molecular orbital , excitation wavelength , photochemistry , wavelength , atomic physics , materials science , molecule , physics , optics , optoelectronics , electron , medicine , organic chemistry , quantum mechanics , pharmacology , programming language , computer science
The band intensities of Raman spectrum of PTZ in the solid state show a clear dependence on the laser excitation wavelength. Such a behaviour, not observed when the spectrum is obtained from PTZ in solution, indicates that in the crystal the molecular. orbital of the compound is perturbed to some extent. The PTZ · SO 2 complex in solution presents the same pre‐resonahce pattern as does solid PTZ, suggesting that the same PTZ orbital is involved in both cases. The most enhanced PTZ modes are those ascribed to the aromatic ring vibrations, indicating an interaction through the π molecular orbitals; it is proposed that PTZ acts as a π‐donor toward SO 2 on the basis of the pre‐resonance pattern of the Raman spectrum of PTZ · SO 2 .