Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 550, Issue -, Pages 177-190Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-2860(00)00385-9
Keywords
Raman spectroscopy; surface enhanced Raman spectroscopy; infrared spectroscopy; density functional theory calculations; adsorption; dyes; cresyl violet perchlorate; coumarin 152
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Infrared, Raman and SERS spectra of two cationic dyes-cresyl violet perchlorate and coumarin 152-were measured. Density function theory calculations were performed in order to support the vibrational spectra assignment. The data obtained indicate that cresyl violet is weakly physisorbed on the silver surface. The molecule is attached to the metal in a vertical configuration with its molecular plane perpendicular to the surface. Both amino groups of the molecule are in proximity to the metal surface. Coumarin 152 interacts with the silver surface through the carbonyl group. The C=O bond is weakened by the adsorption. The interaction with the metal also influences the adjacent double bonds in the lactone ring. Coumarin 152 is bonded to silver in a vertical configuration with its molecular plane perpendicular to the surface as well. (C) 2000 Elsevier Science B.V. All rights reserved.
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