ISSN:
0377-0486
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
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.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jrs.1250220402
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