Amy Keirstead - Porphyrin-Based Hole Conducting Electropolymer

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  Publication Details (including relevant citation   information):

  Paul A. Liddell,   Miguel Gervaldo,   James W.   Bridgewater, Amy E. Keirstead,   Su Lin, Thomas A. Moore,   Ana L. Moore,   Devens Gust

  Chem. Mater. 01/2008; 20(1).


  The monomer   5-(4-aminophenyl)-10,20-bis(2,4,6-trimethylphenyl)porphyrin was   synthesized and found to electropolymerize on platinum, indium   tin oxide, and other electrodes to form a clear, semiconducting   film with strong absorption in the visible spectral region. The   linear, hole-conducting polymer has a unique structure, with   porphyrin units linked to one another through the   5-(4-aminophenyl) nitrogen atom and the carbon atom at the   15-position on the macrocyclic ring. The porphyrin macrocyclic   ring is thus an integral part of the linear polymer backbone. The   oxidation potential of the film is 0.85 V and the reduction   potential is −1.12 V vs SCE. The absorption spectrum of the film   resembles that of a monomeric model porphyrin, but with   significant peak broadening. Streak camera studies of the   fluorescence of the polymer yield a lifetime of 15 ps, indicating   strong quenching of the porphyrin first excited singlet state   relative to that of the monomer. The properties of the polymer   suggest that it may be useful in sensors, catalysts, and solar   energy conversion devices.

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