Biphasic Voltammetry and Spectroelectrochemistry in Polymer of Intrinsic Microporosity—4-(3-Phenylpropyl)-Pyridine Organogel/Aqueous Electrolyte Systems: Reactivity of MnPc Versus MnTPP

Vellaichamy Ganesan, Elena Madrid, R. Malpass-Evans, M. Carta, N B. Mckeown, Frank Marken

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A hydrophobic polymer of intrinsic microporosity (PIM-EA-TB) is employed to stabilize an organogel/aqueous electrolyte phase boundary based on an organic water-insoluble 4-(3-phenylpropyl)-pyridine phase. The organogel with electrocatalytic metal complexes embedded is immobilized on glassy carbon or on transparent mesoporous tin-doped indium oxide (ITO) electrodes. Liquid/liquid ion transfer voltammetry is investigated for a 4-(3-phenylpropyl)-pyridine organogel/aqueous electrolyte interface for two types of redox systems: tetraphenylporphyrinato-Mn(III/II) (MnTPP) and phthalocyanato-Mn(III/II) (MnPc). Electron transfer is shown to be coupled to reversible liquid/liquid anion transfer processes for PF 6 , ClO 4 , SCN , and NO 3 , with a change in mechanism for the more hydrophilic anions Cl , F , and SO 4 2−. In situ UV-Vis spectroelectrochemistry reveals reversible Mn(III/II) redox processes coupled to ion transfer for MnTPP. But further complexity and a detrimental side reaction are observed for MnPc causing gradual loss of the electrochemical response in the presence of dioxygen. [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)295-304
Number of pages10
JournalElectrocatalysis
Volume10
Issue number4
DOIs
Publication statusPublished - 15 Jul 2019

Keywords

  • Anion transfer
  • Catalysis
  • Electrochromic
  • Microporosity
  • Sensor
  • Voltammetry

ASJC Scopus subject areas

  • Electrochemistry

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