THE DECOMPOSITION KINETICS OF HYDROGEN PEROXIDE CATALYSED BY ETHYLENEDIAMINE-TETRAKIS(METHYLENEPHOSPHONATO)IRON(III)
- 1 February 1987
- journal article
- research article
- Published by Taylor & Francis in Journal of Coordination Chemistry
- Vol. 15 (4) , 307-314
- https://doi.org/10.1080/00958978708079786
Abstract
The catalysed decomposition of hydrogen peroxide in the presence of ethylenediaminetetrakis(methylene-phosphonato)iron(III) was studied at various temperatures. The observed rate law is given by -d[H2O2]/dt = k1K/([H+] + K) [Fe(CENTMP)]. where K is the acid-dissociation constant of the aquo complex. A mechanism involving the aquation of the ternary hydroxo complex as the rate-determining step is suggested. The values of k1 and pK were determined at 35°C to be 0.62 × 10−2 and 10.09 repectively. Activation enthalpy and activation entropy for the aquation reaction were determined from Arrhenius plots and found to be ΔH‡ = 74.57 kJ mol−1 and ΔS‡ = 202 J K−1 mol−1. The results are compared with previously reported data on catalysis by the structurally related [Fe(EDTA)] species.Keywords
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