Abstract
Summary The rate of electroreduction of thallium(I) and of its complex with dicyclohexyl-18-crown-6 were investigated in methanolic solutions of tetrabutylammonium perchlorate using admittance measurements at the DME. The analysis of admittance data of thallium(I) alone in methanolic solutions shows behaviour corresponding to the simple Randles-Ershler equivalent circuit. The kinetic parameters of the charge-transfer reaction Tl++e→Tl(Hg)x in the given medium are as follows: ka0≈0.6 cm s−1 and α=0.6. For the thallium(I)-cyclic polyether complex the reactant adsorption is significant and is enhanced towards negative electrode potentials, whereas at potentials more positive than the polarographic half-wave potential the phase angle does not exceed 45°.
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