Detecting photoinduced electron transfer processes in the SERS spectrum of salicylate anion adsorbed on silver nanoparticles
✍ Scribed by J. L. Castro; J. F. Arenas; M. R. López-Ramírez; J. C. Otero
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2006
- Tongue
- English
- Weight
- 196 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
Abstract
The surface‐enhanced Raman scattering (SERS) of salicylic acid (S) adsorbed on a silver sol in H~2~O and D~2~O has been investigated. At pH 5 or greater, the adsorbed species is the salicylate anion (2‐hydroxybenzoate anion) (S^−^), which links to the metal nanoparticle (Ag__~n~) through the carboxylate group (S^−^–Ag~n~). We demonstrate that the selective enhancement of the bands is due mainly to a resonant electron or charge transfer process (ET or CT) from the metallic nanoparticle to the adsorbate, yielding the transient formation of the respective radical dianion (S·^2−^–Ag~n~__^+^). It is found that the enhanced bands, and especially mode 8a;ν~ring~, are related to the differences between the equilibrium structures of the adsorbate in its ground (S^−^) and CT‐excited states (S·^2−^). © 2006 Wiley Periodicals, Inc. Biopolymers 82: 379–383, 2006
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