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Issue 10, 1982
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Equilibria and mechanism of the interaction of InIII with the indicator ferron

Berta Perlmutter-Hayman,  Fernando Secco  and  Marcella Venturini 

Abstract

The interaction between InIII and the indicator ferron (H2L) has been investigated at 25 °C, ionic strength of 0.2 mol dm–3, and [H+]= 0.008–0.2 mol dm–3. Two complexes were observed, namely, [InL]+ with K1= 237 ± 7 and [In(HL)]2+ with K1′= 688 ± 65 dm3 mol–1. The formation of the complexes proceeds via three parallel paths differing in their [H+] dependences. One of these can be uniquely assigned to the reaction between In3+ and H2L with a forward rate constant of (1.1 ± 0.1)× 103 dm3 mol–1 s–1; each of the other two is in fact a proton-ambiguous pair, one involving In3+ and HL–, and/or [In(OH)]2+ and H2L, and the other (which makes a smaller contribution) involving [In(OH)]2+ and HL–, and/or [In(OH)2]+ and H2L. For these pairs, only upper limits for the rate constants can be given. Nevertheless, it can be concluded unequivocally that the hydrolysed species react faster than In3+. The results are compared with previous data involving InIII and are discussed in terms of the dissociative Eigen mechanism vs. an associative mechanism.

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Article type: Paper
DOI: 10.1039/DT9820001945
Citation: J. Chem. Soc., Dalton Trans., 1982,0, 1945-1948
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    Equilibria and mechanism of the interaction of InIII with the indicator ferron

    B. Perlmutter-Hayman, F. Secco and M. Venturini, J. Chem. Soc., Dalton Trans., 1982, 0, 1945
    DOI: 10.1039/DT9820001945

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