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

Author： Shuaib Nadia M.   Marafie Hayat M.   Youngo Hamido Ben   Al-Sogair Fawzia M.   El-Ezaby Mohamed S.  

Publisher： Taylor & Francis Ltd

ISSN： 0095-8972

Source： Journal of Coordination Chemistry, Vol.55, Iss.8, 2002-01, pp. : 933-949

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Abstract

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 TL (analytic concentration of ASX or GLX) dependent, i.e. $$ k_{{rm obs}, i} = A_i + B_i {rm T_L} ({rm at a given { pH}}_i) $$ where Ai and Bi are pH-dependent parameters.

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