Abstract
Polymeric films can be formed on smooth Pt electrodes by oxidative polymerization of cobalt tetrakis(o-aminophenyl)porphyrin, (Co(o-NH{sub 2})TPP). Although the films are extremely thin, as few as two monomolecular layers of porphyrin sites, they exhibit permeabilities to molecular monomers that fall in a regular order of permeant molecular volume. The molecular sieving property is taken as evidence that membrane transport, rather than pinhole transport, is the predominant transport mechanism in these films. The permeability data are supported by film thickness measurements by electrochemical reactivity, surface profilometry, transmission spectrophotometry, ellipsometry, and X-ray photoelectron spectroscopy.
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