Chemistry Journal of Moldova

THE INFLUENCE OF THIOSEMICARBAZONE 2,3-DIHYDROXYBENZALDEHYDE ON CATALYTIC CURRENTS IN THE SYSTEM MOLYBDENUM (VI) – POTASSIUM CHLORATE IN ACID SULFATE SOLUTIONS

Author(s):

Ludmila Chiriac, Tatiana Cazac, I. Povar and M. Revenco


Field: Analytical chemistry
Type: Research paper
Issue: 2011 Volume 6, no.1
Pages: 52-56
Keywords:

voltammetry, catalytic current, molybdenum, thiosemicarbazone 2,3-dihydroxybenzaldehyde, chlorate of potassium.


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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2011.06(1).12

Graphical Abstract:
The polarographic catalytic current in acid solutions of Mo(VI), thiosemicarbazone 2,3-dihydroxybenzaldehyde (TSC 2,3-DHBA) and chlorate ions has been investigated. The scheme of reactions, taking place in the solutions and on the electrode, has been proposed. The increase of the catalytic current is explained by the formation of an active intermediate complex [Mo(V)×TSC 2,3-DHBA (ClO-3)]. The rate constant of this complex formation K = 2.56 × 106 mol-1×dm3×s-1, the activation energy Ea = 15.9 kcal×mol-1 and the reaction activation entropy ∆Sa¹ = -23.5 e.u. have been calculated.

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