The specific ion effect on the kinetics of iodination of acetone in an acidic medium is investigated through UV-vis spectrophotometry as a function of the nature of the acid and of temperature. The results indicate that the order of the reaction with respect to acetone is practically unaffected by the composition of the acid while the value of the mixed constant k1K increases according to the sequence HBr < HCl < HClO₄ < HF < H₂SO₄ < H₃PO₄. The results are discussed in terms of the hydration free energy and size of the anion and of the interaction between the cationic intermediate and the anion.
Specific Anion Effect on the Kinetics of Iodination of Acetone / Lo Nostro, Pierandrea; Mazzini, Virginia; Ninham, Barry W; Ambrosi, Moira; Dei, Luigi; Baglioni, Piero. - In: CHEMPHYSCHEM. - ISSN 1439-4235. - STAMPA. - 17:(2016), pp. 2567-2571. [10.1002/cphc.201600241]
Specific Anion Effect on the Kinetics of Iodination of Acetone
LO NOSTRO, PIERANDREA;AMBROSI, MOIRA;DEI, LUIGI;BAGLIONI, PIERO
2016
Abstract
The specific ion effect on the kinetics of iodination of acetone in an acidic medium is investigated through UV-vis spectrophotometry as a function of the nature of the acid and of temperature. The results indicate that the order of the reaction with respect to acetone is practically unaffected by the composition of the acid while the value of the mixed constant k1K increases according to the sequence HBr < HCl < HClO₄ < HF < H₂SO₄ < H₃PO₄. The results are discussed in terms of the hydration free energy and size of the anion and of the interaction between the cationic intermediate and the anion.
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