Toward molecular selectivity with chemically modified electrodes: can electroactivity and permeability through an overlaying metallopolymer film be controlled via rational manipulation of internal architecture?

Susan G. Yan, Joseph T. Hupp

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Metallopolymeric films featuring widely varying metal-to-metal linkage lengths have been prepared via a combination of oxidative and reductive electropolymerization schemes. Each of the film materials exhibits strong size selective permeability behavior towards molecular reactants, therefore providing a primitive physical basis for selectivity with respect to reactivity at an underlying electrode. Surprisingly, the observed molecular size cut-offs are essentially independent of film composition, implying that a uniform molecular cavity or pore size exists. Attempts to modify effective pore sizes by introducing large ligand substituents (phenyl groups) at the monomer synthesis stage have failed to alter the pattern of size selectivity. We speculate that (a) potential pore size expansion effects expected from linkage length extension are offset by enhanced cross-linking, and/or (b) electrolyte anion templating effects during film synthesis may be defining the effective minimum pore size, thereby yielding uniform permeation size cut-offs.

Original languageEnglish
Pages (from-to)119-126
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume397
Issue number1-2
DOIs
Publication statusPublished - Nov 1995

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Keywords

  • Chemically modified electrodes
  • Electroactivity
  • Film structure
  • Metallopolymer film
  • Molecular selectivity
  • Molecular structure
  • Permeability

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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