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Resonance Raman spectra of insoluble monolayers spread on a water surface
Author(s) -
Takenaka Tohru,
Fukuzaki Hiroko
Publication year - 1979
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.1250080307
Subject(s) - monolayer , raman spectroscopy , surface pressure , chemistry , molecule , adsorption , spectral line , chloroform , analytical chemistry (journal) , crystallography , chromatography , organic chemistry , optics , physics , astronomy , mechanics , biochemistry
Resonance Raman spectra of insoluble (or spread) monolayers of cetyl orange on a water surface have been obtained by the use of a total reflection method previously proposed. The spectra of the monolayers resemble that of solid cetyl orange rather than that of the chloroform solution, suggesting that the structure of cetyl orange in the monolayer is similar to that in the solid state. From polarization measurements of the spectra, the molecular orientation in the monolayers has been examined at various surface pressures. The molecules in the insoluble monolayers show a higher orientation with respect to the vertical axis as compared with those in soluble (or adsorbed) monolayers. The degree of molecular orientation rises with an increase in surface pressure of the monolayers but decreases considerably upon collapse.