Showing papers by "Edoardo Mentasti published in 1983"
TL;DR: The chelating material described in this article has iminodiacetate functional groups chemically bonded to commercial cellulose filters in order to preconcentrate trace metals in aqueous samples.
43 citations
TL;DR: In this article, the authors investigated the kinetics and mechanism of reduction of transcyclohexane-1,2-diamine-NNN′N′-tetra-acetatomanganate(III), [MnIII(cdta)(H2O)] by hydrazine, hydroxylamine, and substituted benzene-1 2-diols C6H3(OH)2R.
Abstract: The kinetics and mechanism of reduction of trans-cyclohexane-1,2-diamine-NNN′N′-tetra-acetatomanganate(III), [MnIII(cdta)(H2O)]–, by hydrazine, hydroxylamine, and a series of substituted benzene-1,2-diols C6H3(OH)2R (R = H, 4-Me, 4-CO2H, or 3-CO2H) have been investigated by the stopped-flow technique. Simple first-order dependence on MnIII complex and reductant concentrations has been observed for hydrazine, which shows a rate with [H+]–1 dependence. For hydroxylamine, complex kinetic dependences on reductant and hydrogen-ion concentration suggest a composite inner-sphere mechanism. Also, in the case of the diols an inner-sphere mechanism, through intermediate association, is proposed; for these substrates experimental rates, higher than those computed with the Marcus cross relation, and limiting kinetics are in agreement with the lability of the oxidizing complex.
15 citations
TL;DR: In this paper, the authors reported equilibrium data on the stability of the intermediate complexes, and kinetic data for the fast complex formation, as well as for the slower redox decomposition.
Abstract: FeIII reacts with mercaptocarboxylic acids (HORSH), such as 2-mercaptoethanoic acid, 2-mercaptopropanoic acid, 2-mercapto-1,4-butanedioic acid and penicillamine (2-amino3-methyl-3-mercaptobutanoic acid) to give, in perchloric acid medium, 1∶1 complexes, Fe3++HORSH⇄Fe(OSR)++ 2H+. These complexes then undergo redox decomposition to give a disulphide dimer: 2Fe(OSR)++2H+⇄2Fe2++ HOR-S- S- ROH. The present study reports equilibrium data on the stability of the intermediate complexes, and kinetic data for the fast complex formation, as well as for the slower redox decomposition.
6 citations
TL;DR: In this article, the kinetics and mechanism of the oxidation of iminodiacetic acid and N-methyliminodiacic acid by aquasilver(II) and Ag(II)-2,2′-bipyridine complexes has been investigated.
Abstract: The kinetics and mechanism of oxidation of iminodiacetic acid and N-methyliminodiacetic acid by aquasilver(II) and Ag(II)-2,2′-bipyridine complexes has been investigated. The results are discussed with reference to the active reaction pathways, the equilibrium quotient of the title reactions, the protolytic equilibria which involve the oxidizing complex, and the intrinsic self-exchange rates of the oxidants.