Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Surface-enhanced Raman Spectroscopy of Quinomethionate Adsorbed on Silver Colloids

  • Kim, Mak-Soon (Department of Chemistry Education, Kyungpook National University) ;
  • Kang, Jae-Soo (Department of Chemistry Education, Kyungpook National University) ;
  • Park, Si-Bum (Department of Chemistry Education, Kyungpook National University) ;
  • Lee, Mu-Sang (Department of Chemistry Education, Kyungpook National University)
  • Published : 2003.05.20
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Abstract

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.

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