Square‐wave voltammetry of 4,4′‐diisopropyl‐2,2′‐bithiazoline and its complex with copper(II)

Abstract

Abstract(4S)-4'-diisopropyl-2,2'-bithiazoline (DPT) is an electroactive organic chiral compound giving two reduction responses in square-wave voltammograms at potentials about -0.2 and -0.4 V by forming a complex with mercury which deposits at the electrode surface. By the addition of copper(n) ion to the solution of DF'T a third peak appears between them at about -0.3 V, which corresponds to the reduction of adsorbed Cu-DPT complex. Optimal pH for the investigation of those redox processes was found to be 2.8. By square-wave voltammeuic measurements it was interpreted that these redox reactions were quasireversible with immobilized reactants. By plotting ip/fvs. frequency a quasireversible maximum was obtained, and the apparent standard reaction rate constants were calculated: log ( k s )~P T = (0.91 ? 0.9) and 1 < k, < 65 s-', log ( k s ) c u D~= (0.35 t 0.9) and 0.3 < k, < 18 sC1 in 0.55 M NaCI.

Determination of Ytterbium Traces by Cathodic Stripping Voltammetry

“…For quasireversible reactions the shape of Di/Df curve is parabolic with so called ™quasireversible maximum∫. That maximum is often used to estimate the standard reaction rate [15,16] from the equation log k s log k max 0.75 log f max . As is evident, f max 150 s À 1 (Fig.…”