The surface-enhanced Raman spectrum of 2,2’-bipyrimidine adsorbed on silver sol has been obtained and analyzed by using a vibrational assignment previously determined for this azoaromatic molecule. Evidence was found for Ag-N bond formation with the silver substrate and a model is proposed for the adsorption on the basis of a very close similarity of the SER data with the normal Raman spectrum of a 1:l complex with AgNO3. Normal-mode analysis suggests a planar conformation for the adsorbed species, with the molecule perpendicular to the metal, bound through N atoms. Variation of relative intensities of Raman bands with different exciting lines is consistent with a charge-transfer contribution to the enhancement of the scattering cross section.
Surface-enhanced Raman spectra of 2,2'-bipyrimidine adsorbed on silver sol / G. Sbrana; N. Neto; M. Muniz-Miranda; M. Nocentini. - In: THE JOURNAL OF PHYSICAL CHEMISTRY. - ISSN 0022-3654. - STAMPA. - 94:(1990), pp. 3706-3710. [10.1021/j100372a064]
Surface-enhanced Raman spectra of 2,2'-bipyrimidine adsorbed on silver sol
NETO, NATALE;MUNIZ-MIRANDA, MAURIZIO;
1990
Abstract
The surface-enhanced Raman spectrum of 2,2’-bipyrimidine adsorbed on silver sol has been obtained and analyzed by using a vibrational assignment previously determined for this azoaromatic molecule. Evidence was found for Ag-N bond formation with the silver substrate and a model is proposed for the adsorption on the basis of a very close similarity of the SER data with the normal Raman spectrum of a 1:l complex with AgNO3. Normal-mode analysis suggests a planar conformation for the adsorbed species, with the molecule perpendicular to the metal, bound through N atoms. Variation of relative intensities of Raman bands with different exciting lines is consistent with a charge-transfer contribution to the enhancement of the scattering cross section.File | Dimensione | Formato | |
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