Abstract
The kinetics of complex formation between Methylthymol Blue (MTB) and Mg2+ has been investigated between pH 6.15 and 8.0 by laser temperature-jump relaxation spectrometry. In addition to a fast, not time-resolved amplitude change, which is attributed to protolytic reactions, two resolvable relaxation processes have been found in the millisecond time range and are assigned to the binding of Mg2+ to different protolytic states of MTB. The ratio of the corresponding relaxation times is around 3. From the Mg2+ concentration and the pH dependence of the slower of the two relaxation times the kinetic parameters related to 1:1 and 1:2 complex formation (MTB:Mg2+) have been calculated on the basis of a detailed binding model considering different protolytic states of bound and unbound ligand. The rate constants of complex formation between the ligand's fully deprotonated coordination sites and Mg2+ are around 107 M-1 s-1 and are in good agreement with the Eigen−Wilkins mechanism, whereas those between its monopro...
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