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Surface‐enhanced Raman spectroscopic study of isomeric anisidines adsorbed on colloidal silver particles
Author(s) -
Sarkar Uttam K.,
Chakrabarti Subhasis,
Misra T. N.
Publication year - 1993
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250240207
Subject(s) - raman spectroscopy , molecule , raman scattering , adsorption , chemistry , ring (chemistry) , metal , surface enhanced raman spectroscopy , atom (system on chip) , photochemistry , analytical chemistry (journal) , crystallography , organic chemistry , physics , computer science , optics , embedded system
Abstract Surface‐enhanced Raman scattering (SERS) spectra of o ‐, m ‐ and p ‐anisidine molecules were compared with the solution Raman spectra. The experimental results suggest that the o ‐ and m ‐anisidine molecules are adsorbed on the metal surface principally through the nitrogen atom, whereas the p ‐anisidine molecules are adsorbed through the π‐system of the phenyl ring. This observation is explained in terms of the electron densities on the N and O atoms and in the phenyl ring as reflected by the Hammett σ values of the isomers. Charge‐transfer interactions have been shown to contribute significantly to SERS.