Study of redox processes in zeolite Y-associated 2,4,6-triphenylthiopyrylium ion by square wave voltammetry

Antonio Domenech, Hermenegildo Garcia, Mercedes Alvaro, Esther Carbonell Llopis

Research output: Contribution to journalArticlepeer-review

Abstract

The electrochemical responses of 2,4,6-triphenylthiopyrylium ion (TTP+) in solution and attached to zeolite Y (TTP@Y) are described using cyclic and square wave voltammetries upon immersion of zeolite-modified polymer film electrodes in MeCN (LiClO4, Et4NClO4, and BuN4PF6 electrolytes) and aqueous (LiNO3, NaNO3, and KNO3 electrolytes) media. The electrochemistry of TTP@Y in contact with Bu4NPF6/MeCN is identical to that of TTP(BF4) in solution, with reduction processes at -0.25, -0.74, and -1.36 V vs SCE, and oxidation steps at +0.85 and +1.11 V. This response differs from those obtained for TTP@Y in Et4NClO4/MeCN and LiClO4/MeCN electrolytes. In contact with aqueous electrolytes, TTP@Y displays a reversible one-electron transfer at -0.25 V in contrast with the adsorptive behavior observed for solid TTP(BF4) attached to graphite, platinum, and gold electrodes. For TTP@Y, two different thick-layer and thin-layer responses are obtained which can be attributed to different topological redox isomers associated to different sites in the zeolite boundary. Thermochemical data for such processes are obtained from the temperature dependence of electrode potentials.

Original languageEnglish
Pages (from-to)3040-3050
Number of pages11
JournalJournal of physical chemistry B
Volume107
Issue number13
DOIs
Publication statusPublished - 3 Apr 2003
Externally publishedYes

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