Open AccessThe 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,
Igor Povar,
M. Revenco
Publication year - 2011
Publication title -
chemistry journal of moldova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.275
H-Index - 5
eISSN - 2345-1688
pISSN - 1857-1727
DOI - 10.19261/cjm.2011.06(1).12
Subject(s) - chemistry , catalysis , inorganic chemistry , chlorate , semicarbazone , molybdenum , activation energy , vanadium , sodium chlorate , sulfate , polarography , medicinal chemistry , organic chemistry
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.