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

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 397; no. 1; pp. 119 - 126
• Main Authors: Yan, Susan G., Hupp, Joseph T.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.1995; Elsevier Science
• Subjects: Chemically modified electrodes; Chemistry; Electroactivity; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; Film structure; General and physical chemistry; Metallopolymer film; Molecular selectivity; Molecular structure; Other electrodes; Permeability; Molecular selectivity; Metallopolymer film; Molecular structure; Chemically modified electrodes; Film structure; Permeability; Electroactivity; Cationic complex; Pyridine derivative polymer; Coating material; Organometallic polymer; Organic ligand; Transition metal; Transition metal Complexes; Experimental study; Redox polymer; Electrochemical polymerization; Metallocene; Electrodes; Iron Organic compounds; Organic solvent; Platinum; Acetonitrile; Selective permeability; Ruthenium Complexes; Platinoid Complexes; Oxidation; Property structure relationship; Electrochemical reaction; Modified material
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/0022-0728(95)04176-3

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.