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

✍ Scribed by Marina Mlakar; Ivan Čuljak

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
439 KB
Volume
9
Category
Article
ISSN
1040-0397

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✦ Synopsis

Abstract

(4__S__)‐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(II) ion to the solution of DPT 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 voltammetric measurements it was interpreted that these redox reactions were quasireversible with immobilized reactants. By plotting i~p~/f vs. frequency a quasireversible maximum was obtained, and the apparent standard reaction rate constants were calculated: log (k~s~)DPT=(0.91 ± 0.9) and 1 < k~s~ < 65~S~^−1^, log (k~s~)~CuDPT~= (0.35 ± 0.9) and 0.3 < k~s~ < 18 S^−1^ in 0.55 M NaCl.

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## Abstract The reaction of the new, bis(bidentate), potentially dinucleating ligand 4‐isobutyl‐3,5‐di(2‐pyridyl)‐4__H__‐1,2,4‐triazole (ibdpt) with M(ClO~4~)~2~·6H~2~O (M = Co^II^, Ni^II^ or Cu^II^) in a1:1 molar ratio in MeCN affords the dinuclear complexes [Co^II^~2~(ibdpt)~2~(MeCN)~2~(H~2~O)~2~