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Mechanism of Complex Formation Between Benzene-1,2-diol and Aqua-palladium(II). Equilibria and Kinetics in Acidic Aqueous Perchlorate Media

DOI: 10.1039/DT9810000137

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 137 - 141 (1981)

Update date:2022-08-10

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Authors:

Coe, John S.Coe, John S.

Mentasti, EdoardoMentasti, Edoardo

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Article abstract of DOI:10.1039/DT9810000137

Palladium(II) aqua-ions, in acidic aqueous perchlorate solution, react rapidly with benzene-1,2-diol (catechol) to form a 1:1 green complex.From equilibrium spectrophotometric data the reaction quotient Keq. + 2H(+)> is found to be (6+/-2)E-3 mol dm-3 at 25 deg C and I = 0.20 mol dm-3.The rate of the forward reaction, first order in the concentration of each reagent and with a combined (-1) and (-2) dependence, is interpreted in terms of reactions involving (1+) and Pd2 with the diol to give a 1:1 chelate complex.The reverse reaction has been investigated independently by treating the complex with excess of HClO4 and the two-stage mechanism is discussed with reference to a general scheme which takes into account the possible intermediate species.

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