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Raman spectroscopic study of complex formation between dimethyl sulfoxide and chloroform
Author(s) -
Rintoul L.,
Shurvell H. F.
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.1250210806
Subject(s) - chloroform , dimethyl sulfoxide , raman spectroscopy , chemistry , mole fraction , analytical chemistry (journal) , sulfur , sulfoxide , envelope (radar) , organic chemistry , optics , physics , telecommunications , radar , computer science
The sulfur‐oxygen stretching region of dimethyl sulfoxide (DMSO) in chloroform solutions has been studied by means of Raman spectroscopy. The number of linearly independent spectral components in the SO stretching band envelope was determined to be four by factor analysis. The overall band envelope was fitted with five Lorentz‐Gaussian functions using a non‐linear least‐squares procedure. The results were found to be consistent with the formation of 1:1 and 1:2 DMSOCHCl 3 complexes, which give rise to bands centered at 1054 and 1032 cm −1 , respectively. Equilibrium constants could not be calculated because of coincidences between bands of pure DMSO and bands due to the two DMSOCHCl 3 complexes. The spectrum of a 0.0065 mole fraction DMSO solution in chloroform indicates a nearly complete conversion of DMSO species to the 1:1 chloroform complexes at this concentration. A very weak Raman band at 1018 cm −1 and an IR band of medium intensity at 1017 cm −1 in the spectra of pure DMSO were detected by the use of band‐fitting techniques. The assignments of these bands and the other bands in the methyl rocking region are discussed.