Abstract
AbstractThe 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 ( NO−) being reduced to form an NH2 group. The SER spectra of this new species are enhanced for potentials more negative than −0.7 V.
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