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Detecting photoinduced electron transfer processes in the SERS spectrum of salicylate anion adsorbed on silver nanoparticles
Author(s) -
Castro J. L.,
Arenas J. F.,
LópezRamírez M. R.,
Otero J. C.
Publication year - 2006
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.20490
Subject(s) - chemistry , nanoparticle , carboxylate , adsorption , ion , metal , photochemistry , preprint , electron transfer , excited state , metal ions in aqueous solution , photoinduced electron transfer , nanotechnology , stereochemistry , organic chemistry , atomic physics , materials science , physics , world wide web , computer science
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 This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com