The hydrolysis of hydroxamic acid complexants in the presence of non-oxidizing metal ions 3:ferric ions at elevated temperatures

Andrieux, Fabrice and Boxall, Colin and Steele, Helen and Taylor, Robin (2014) The hydrolysis of hydroxamic acid complexants in the presence of non-oxidizing metal ions 3:ferric ions at elevated temperatures. Journal of Solution Chemistry, 43 (3). pp. 608-622. ISSN 0095-9782

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Abstract

The hydrolysis of acetohydroxamic acid (AHA) was investigated both in the absence and presence of ferric ions at the range of temperatures (293–333 K). The data were then analyzed using a previously published mathematical model to determine the Arrhenius factor (A) and activation energy (Ea) of the hydrolysis reactions of free AHA and AHA bound to iron in the form of the monoacetohydroxamatoiron(III) complex. The Arrhenius factor and activation energy were found to be 4.24 9 109 dm3mol-1s-1 and 80.1 kJmol-1 respectively for the hydrolysis of free AHA in solution and 2.44 9 1011 dm3mol-1s-1 and 89.6 kJmol-1 respectively for the hydrolysis of ironbound AHA, suggesting a difference in the mechanism for the hydrolysis of the free and complexed ligand. This was further investigated using quantum mechanical calculations.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Solution Chemistry
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1300/1304
Subjects:
ID Code:
68975
Deposited By:
Deposited On:
25 Mar 2014 11:31
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Mar 2020 03:50