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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 24, Number 5
BKCSDE 24(5)
May 20, 2003 

Surface-enhanced Raman Spectroscopy of Quinomethionate Adsorbed on Silver Colloids
Mak Soon Kim, Jae Soo Kang, Si Bum Park, Mu Sang Lee
Surface-enhanced Raman spectroscopy, Insectcide, Quinomethionate
We have studied the surface-enhanced Raman spectroscopy (SERS) spectrum of quinomethionate (6-methyl- 1,3-dithiolo[4,5-b]quinoxalin-2-one), which is an insecticide or fungicide used on vegetables and wheat. We observed no signals in the ordinary Raman spectra of solid-state quinomethionate, but when it was adsorbed on a colloidal silver surface, strong vibrational signals were obtained at a very low concentration. The SERS spectra were obtained by silver colloids prepared by the Creighton et al. method. The influence of pH and the aggregation inductors (Cl-, Br-, I-, F-) on the adsorption mechanism was investigated. Two different adsorption mechanisms were deduced, depending on the experimental conditions: The one N atom or two N atoms are chemisorbed on an Ag surface. An important contribution of the chemical mechanism was inferred when the one N atom was perpendicularly adsorbed on a surface. It is possible that quinomethionate can be detected to about 10-5 M.
633 - 637
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