M. Shibata, P. Zuman
Jan 15, 1997
Citations
1
Influential Citations
16
Citations
Journal
Journal of Electroanalytical Chemistry
Abstract
Abstract Maleic hydrazide (3,6-dihydroxypyridazine. I) is reduced to the dicarbonyl form I at the dropping mercury electrode in two-electron waves. The first wave I 1 corresponds to a reduction of a diprotonated, the second I 2 of a monoprotonated, the third I 3 of an unprotonated and the fourth I 4 of an anionic form. Exclusion of the dihydroxy form I″ and the monohydroxy form I′ as electroactive species was based on electrochemical properties and comparison of p K a values. Polarographic currents are limited by the rate of protonation occurring as a surface, heterogeneous process. Wave I 1 at pH 3 to 5 is the most suitable for analytical applications.