SURFACE ENHANCED RAMAN STUDY OF BENZIDINE ON $Ag$ ELECTRODE: AN INTERPRETATION FOR DIFFERENT ADSORPTION CONFIGURATION AT VARIOUS APPLIED VOLTAGES
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Date
1987
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Ohio State University
Abstract
The surface enhanced Raman spectra of benzidine in the Ag 501 and on the Ag electrode at different applied voltages are reported. These spectra are compared with those in the crystalline form and in the dimethyl sulfosgide solution with the group theoretical analysis. It is interpreted that in the Ag 501 and on the Ag electrode with voltage larger than -0.2 v (with respect to the standard Calomel electrode) the benzidine molecule is adsorbed perpendicularly with one of its two amino groups attached on the Ag surface. While the applied voltages on the Ag surface are less than -0.4 v both of its amino groups are adsorbed on the Ag surface with the flat configuration. The adsorption mechanism for these two configurations is also proposed in the report.
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Author Institution: Laboratory of Vibrational Spectroscopy, Institute of Chemistry