Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 12, Issue 3-4, Pages 266-270Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/pat.136
Keywords
cobalt porphyrins; alkyl substituents; meso sites; electroreduction of dioxygen
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A set of cobalt porphyrins containing alkyl substituents in their meso sites were synthesized ani compared as catalysts for the electroreduction of O-2 when adsorbed on the surface of graphite electrodes. The meso substituents examined included ethyl, propyl, n-butyl and n-pentyl. All but the last exhibited high catalytic activity for the electroreduction of O-2 by four electrons. The catalytic activity was attributed to spontaneous aggregation of the porphyrins to produce structures in which pairs of cobalt centers could be bridged by O-2 molecules as previously observed for the unsubstituted and tetramethyl analogs. Copyright (C) 2001 John Wiley & Sons, Ltd.
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