Poly(2,2′-spaced-dipyrroles): Bandgap contraction by additive and charge-transfer mechanisms

Authors

  • Prof Giorgio Pagani,

    Corresponding author
    1. Dipartimento di Chimica Organica e Industriale and Centro CNR Sintesi e Stereochimica Speciali Sistemi Organici via Golgi 19, I-20133 Milano (Italy)
    • Dipartimento di Chimica Organica e Industriale and Centro CNR Sintesi e Stereochimica Speciali Sistemi Organici via Golgi 19, I-20133 Milano (Italy)
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  • Dr. Anna Berlin,

    1. Dipartimento di Chimica Organica e Industriale and Centro CNR Sintesi e Stereochimica Speciali Sistemi Organici via Golgi 19, I-20133 Milano (Italy)
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  • Dr. Augusto Canavesi,

    1. Dipartimento di Chimica Organica e Industriale and Centro CNR Sintesi e Stereochimica Speciali Sistemi Organici via Golgi 19, I-20133 Milano (Italy)
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  • Dr. Gilberto Schiavon,

    1. Istituto CNR di Polarografia ed Elettrochimica Preparativa c. o Stati Uniti 4 I-35020 Padova (Italy)
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  • Dr. Sandro Zecchin,

    1. Istituto CNR di Polarografia ed Elettrochimica Preparativa c. o Stati Uniti 4 I-35020 Padova (Italy)
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  • Gianni Zotti

    Corresponding author
    1. Istituto CNR di Polarografia ed Elettrochimica Preparativa c. o Stati Uniti 4 I-35020 Padova (Italy)
    • Istituto CNR di Polarografia ed Elettrochimica Preparativa c. o Stati Uniti 4 I-35020 Padova (Italy)
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  • The authors thank R. Salmaso and S. Sitran of the CNR for their technical assistance.

Abstract

A strategy to decrease the bandgap of polypyrrole in modified pyrrole-based polymers is the alternation of acceptor (A) and donor (D) groups in the chain. The synthesis of appropriate monomers, their electropolymerization to polyconjugated conducting polymers, and evidence for the narrow bandgap properties of the corresponding neutral systems are described. It is demonstrated that in the presence of specific charge-transfer interactions between the A and D groups the decrease in the bandgap is strongly enhanced.

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