Abstract
A hole- and electron-conducting polymer has been prepared by electropolymerization of a porphyrin–fullerene monomer. The porphyrin units are linked by aminophenylgroups to form a linear chain in which the porphyrin is an integral part of the polymer backbone. The absorption spectrum of a film formed on indium-tin-oxide-coated glass resembles that of a model porphyrin–fullerene dyad, but with significant peak broadening. The film demonstrates a first oxidation potential of 0.75 V vs.SCE, corresponding to oxidation of the porphyrinpolymer, and a first reduction potential of −0.63 V vs.SCE, corresponding to fullerenereduction. Time-resolved fluorescence studies show that the porphyrin first excited singlet state is strongly quenched by photoinduced electron transfer to fullerene. Transient absorption investigations reveal that excitation generates mobile charge carriers that recombine by both geminate and nongeminate pathways over a large range of time scales. Similar studies on a related polymer that lacks the fullerene component show complex, laser-intensity-dependent photoinduced electron transfer behavior. The properties of the porphyrin–fullerene electropolymer suggest that it may be useful in organic photovoltaic applications, wherein light absorption leads to charge separation within picoseconds in a “molecular heterojunction” with no requirement for exciton migration.
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This article is published as part of a themed issue in appreciation of the many important contributions made to the field of molecular photophysics by Jan Verhoeven.
Electronic supplementary information (ESI) available: Synthesis and characterization of new compounds, experimental details for electrochemical and spectroscopic studies, Fig. S2 showing transient absorption kinetics at 880 nm for poly1 on ITO-coated glass. See DOI: 10.1039/c0pp00013b
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Gervaldo, M., Liddell, P.A., Kodis, G. et al. A photo- and electrochemically-active porphyrin–fullerene dyad electropolymer. Photochem Photobiol Sci 9, 890–900 (2010). https://doi.org/10.1039/c0pp00013b
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DOI: https://doi.org/10.1039/c0pp00013b