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Raman and surface-enhanced Raman scattering of violuric acid and violurate ion adsorbed on a silver electrode

de Oliveira, L. F. C. ; Santos, P. S. ; Rubim, J. C.

Journal of Raman spectroscopy, 1991-04, Vol.22 (4), p.197-203 [Periódico revisado por pares]

Chichester, UK: John Wiley & Sons, Ltd

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  • Título:
    Raman and surface-enhanced Raman scattering of violuric acid and violurate ion adsorbed on a silver electrode
  • Autor: de Oliveira, L. F. C. ; Santos, P. S. ; Rubim, J. C.
  • Assuntos: Atomic and molecular physics ; Exact sciences and technology ; Infrared spectra ; Molecular properties and interactions with photons ; Molecular spectra ; Physics
  • É parte de: Journal of Raman spectroscopy, 1991-04, Vol.22 (4), p.197-203
  • Notas: ArticleID:JRS1250220402
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    istex:6067D0DAC75E87E03F9DE020A5E28F6B3C678603
    ObjectType-Article-2
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    content type line 23
  • Descrição: The Raman spectra of violuric acid [2,4,6(1H,3H)‐pyrimidinetrione‐5‐oxime, H3 V] and sodium violurate (NaH2V) were investigated as solids and in aqueous solution at different pH. A tentative vibrational assignment is presented. From the Raman spectra obtained in solution it was possible to identify some characteristic Raman shifts for H3V, H2V− and HV2− (violurate dianion). The surface‐enhanced Raman (SER) spectra of the H2V− ion adsorbed on a silver electrode in borate buffer solution (pH 8.4) was also investigated. For potentials less negative than −0.5 V the H2V− anion adsorbs with the nitrogen atom of the oxime group and the oxygen atom of a neighbouring carbonyl group towards the surface. For potentials more negative the surface species undergoes reduction, with the oximate group ( NO−) being reduced to form an NH2 group. The SER spectra of this new species are enhanced for potentials more negative than −0.7 V.
  • Editor: Chichester, UK: John Wiley & Sons, Ltd
  • Idioma: Inglês
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