Kinetics and Mechanisms of the Chromium(III) Reactions with 2,4- and 2,5-Dihydroxybenzoic Acids in Weak Acidic Aqueous Solutions
Joint Authors
Petrou, Athinoula L.
Zavitsanos, Kimon
Source
Bioinorganic Chemistry and Applications
Issue
Vol. 2010, Issue 2010 (31 Dec. 2010), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2010-07-11
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
The reactions of 2,4- and 2,5-dihydroxybenzoic acids (dihydroxybenzoic acid, DHBA) with chromium(III) in weak acidic aqueous solutions have been shown to take place in at least two stages.
The first stage of the reactions has an observed rate constant k1(obs)=k1[DHBA]+C and the corresponding activation parameters are ΔH1(2,4)≠=49,5 kJ/mol−1, ΔS1(2,4)≠=−103,7 J mol−1 K−1, ΔH1(2,5)≠=60,3 kJ/mol−1, and ΔS1(2,5)≠=−68,0 J mol−1 K−1.
These are composite activation parameters and the breaking of the strong intramolecular hydrogen bonding in the two ligands is suggested to be the first step of the (composite) first stage of the reactions.
The second stage is ligand concentration independent and is thus attributed to a chelation process.
The corresponding activation parameters are ΔH2(2,4)≠=45,13 kJ/mol−1, ΔS2(2,4)≠=−185,9 J mol−1 K−1, ΔH2(2,5)≠=54,55 kJ/mol−1, and ΔS2(2,5)≠=−154,8 J mol−1 K−1.
The activation parameters support an associative mechanism for the second stage of the reactions.
The various substitution processes are accompanied by proton release, resulting in pH decrease.
American Psychological Association (APA)
Zavitsanos, Kimon& Petrou, Athinoula L.. 2010. Kinetics and Mechanisms of the Chromium(III) Reactions with 2,4- and 2,5-Dihydroxybenzoic Acids in Weak Acidic Aqueous Solutions. Bioinorganic Chemistry and Applications،Vol. 2010, no. 2010, pp.1-10.
https://search.emarefa.net/detail/BIM-501785
Modern Language Association (MLA)
Zavitsanos, Kimon& Petrou, Athinoula L.. Kinetics and Mechanisms of the Chromium(III) Reactions with 2,4- and 2,5-Dihydroxybenzoic Acids in Weak Acidic Aqueous Solutions. Bioinorganic Chemistry and Applications No. 2010 (2010), pp.1-10.
https://search.emarefa.net/detail/BIM-501785
American Medical Association (AMA)
Zavitsanos, Kimon& Petrou, Athinoula L.. Kinetics and Mechanisms of the Chromium(III) Reactions with 2,4- and 2,5-Dihydroxybenzoic Acids in Weak Acidic Aqueous Solutions. Bioinorganic Chemistry and Applications. 2010. Vol. 2010, no. 2010, pp.1-10.
https://search.emarefa.net/detail/BIM-501785
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-501785