Electro- and magneto-electrochemistry of zeolite Y- and MCM-41-associated bipyrylium ion

Antonio Doménech, Hermenegildo García, Esther Carbonell Llopis

Research output: Contribution to journalArticlepeer-review

Abstract

The electrochemical response of bipyrylium bication [1,4-bis(3,5-diphenyl- 4-pyrylium)phenylene] associated with Y and MCM-41 aluminosilicates (BTP@Y and BTP@MCM, respectively) is described using polymer-film electrodes immersed into Et4N+ + MeCN and Bu4N+ + MeCN electrolytes. BTP@MCM provides a solution-like response in all electrolytes consisting in two successive strongly comproportionation mediated one-electron reduction processes near to +0.05 and -0.12 V vs. Ag|AgCl. The response of BTP@Y in Bu4N+ + MeCN is restricted to a unique reduction process near to -0.40 V, while in Et4N+ + MeCN, it differs significantly: here, two reduction processes at -0.22 and -0.36 V appear. This response suggests the presence of different boundary-associated topological redox isomers for which no significant comproportionation reaction occurs. Under the application of a static magnetic field, the electrochemical response of BTP@MCM remains almost unchanged while that of BTP@Y in contact with Et 4N+ + MeCN is sensitive to changes in the orientation and strength of the external magnetic field. Such magnetoelectrochemical effects are consistent with the idea that different boundary-associated orientation isomers of BTP@Y exist.

Original languageEnglish
Pages (from-to)249-262
Number of pages14
JournalJournal of Electroanalytical Chemistry
Volume577
Issue number2
DOIs
Publication statusPublished - 1 Apr 2005
Externally publishedYes

Keywords

  • Bipyrylium ion
  • Magnetoelectrochemistry
  • Redox isomers
  • Y and MCM-41 aluminosilicates

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