Surface‐enhanced Raman spectroscopic study of isomeric anisidines adsorbed on colloidal silver particles

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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.