The influence of 2,3-dihydroxybenzaldehyde thiosemicarbazone on catalytic currents in the system molybdenum(VI) – potassium chlorate in acid sulfate solutions
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2019-04-16 08:34
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CHIRIAC, Liudmila; CAZAC, Tatiana; POVAR, Igor; REVENCO, Mihail. The influence of 2,3-dihydroxybenzaldehyde thiosemicarbazone on catalytic currents in the system molybdenum(VI) – potassium chlorate in acid sulfate solutions. In: Chemistry Journal of Moldova. 2011, nr. 1(6), pp. 52-56. ISSN 1857-1727.
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Chemistry Journal of Moldova
Numărul 1(6) / 2011 / ISSN 1857-1727 /ISSNe 2345-1688

The influence of 2,3-dihydroxybenzaldehyde thiosemicarbazone on catalytic currents in the system molybdenum(VI) – potassium chlorate in acid sulfate solutions

Pag. 52-56

Chiriac Liudmila1, Cazac Tatiana1, Povar Igor1, Revenco Mihail2
 
1 Institute of Chemistry of the Academy of Sciences of Moldova,
2 State University of Moldova
 
Disponibil în IBN: 29 noiembrie 2013


Rezumat

The polarographic catalytic current in acid solutions of Mo(VI), 2,3-dihydroxybenzaldehyde thiosemicarbazone (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 ∆Sa≠ = -23.5 e.u. have been calculated.

Cuvinte-cheie
voltammetry, catalytic current, thiosemicarbazone 2, 3-dihydroxybenzaldehyde,

molybdenum