 ISSN 0235-7216 ISSN 2424-4538 (online) |
2007 m. Nr. 4 In-situ surface-enhanced Raman spectroscopic
investigation of NH site of indole ring-terminated
self-assembled monolayer on gold electrode
Isotopic H / D exchange and hydrogen bonding interaction at N1H site of indole ring-terminated self-assembled monolayer (SAM) on gold electrode in neutral aqueous solutions was studied by surface-enhanced Raman spectroscopy (SERS). From an analysis of W17 mode (a mixture of benzene ring and N1H group motion) in electrolytes prepared from H2O and D2O solvent it was found that water accessibility to the indole N1H sites increases at –0.70 V electrode potential as compared with 0.30 V (vs Ag / AgCl, 3M KCl). Data on potential dependence of the W17 mode frequency suggested an increase in hydrogen bonding interaction strength at N1H indole site at sufficiently negative electrode potentials. Keywords: indole, tryptophan, gold, SAM, surface enhanced Raman spectroscopy |
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