The Binding Affinity of Fe(III) to Aspartic Acid and Glutamic Acid Monohydroxamates

The solution spectra of Fe(III) complexes with aspartic acid (ASX) and glutamic acid (GLX) monohydroxamates were analyzed in the UV-Vis region for different complex species using STAR-94 programs in the pH range ¨ 1.0-4.0, at ionic strength (I) of 0.15 M NaCl and T = 25°C. Several monomeric complex...

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Bibliographic Details
Published in:Journal of coordination chemistry 2002, Vol.55 (8), p.933-949
Main Authors: Shuaib, Nadia M., Marafie, Hayat M., Youngo, Hamido Ben, Al-Sogair, Fawzia M., El-Ezaby, Mohamed S.
Format: Article
Language:English
Subjects:
Fe(III)
Formation Constants
Hydroxamates
Rate Constants
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Summary:The solution spectra of Fe(III) complexes with aspartic acid (ASX) and glutamic acid (GLX) monohydroxamates were analyzed in the UV-Vis region for different complex species using STAR-94 programs in the pH range ¨ 1.0-4.0, at ionic strength (I) of 0.15 M NaCl and T = 25°C. Several monomeric complex species were obtained including some mixed hydroxo species. The reaction kinetics of the Fe(III)-(ASX or GLX) systems were carried out at I = 0.15 M NaCl and T = 25°C in the time range of the stopped-flow method. The pseudofirst-order rate constants were pH as well as T L (analytic concentration of ASX or GLX) dependent, i.e. k obs,i = A i + B i T L (at a given pH i ) where A i and B i are pH-dependent parameters.
ISSN:0095-8972
1029-0389
DOI:10.1080/0095897022000002268