Advanced Materials

Electrochemistry of polydialkylcyclopentadithiophenes—modulation of π dimerization by interchain spacing groups

Authors

  • Dr. Gianni Zotti,

    Corresponding author
    1. Istituto di Polarografia ed Elettrochimica Preparativa Consiglio Nazionale delle Ricerche c.o Stati Uniti 4, I-35020 Padova (Italy)
    • Istituto di Polarografia ed Elettrochimica Preparativa Consiglio Nazionale delle Ricerche c.o Stati Uniti 4, I-35020 Padova (Italy)
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  • Dr. Anna Berlin,

    1. Dipartimento di Chimica Organica e Industriale dell'Università and Centro CNR Speciali Sistemi Organici via C. Golgi 19, I-20133 Milano (Italy)
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  • Prof. Giorgio Pagani,

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

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

    1. Istituto di Polarografia ed Elettrochimica Preparativa Consiglio Nazionale delle Ricerche c.o Stati Uniti 4, I-35020 Padova (Italy)
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  • The authors would like to thank Dr. G. Casalbore and Dr. G. Beggiato (CNR, Bologna) for running UV-vis spectra, and R. Salmaso and S. Sitran (CNR, Padova) for technical assistance. Financial support from Progetto Finalizzato Materiali Speciali per Tecnologie Avanzate of CNR is gratefully acknowledged.

Abstract

π dimerization in polythiophenes, leading to stabilization of the intermediate polaronic form, hasrecently been proposed as the origin of the distinctive twin process in the oxidation cycles of polythiophenes. Electrochemical measurements on polymers obtained by anodic cupling 4,4-di-n-alkylcyclopentadithiophene (see Fugure) confirm this; the π dimerization operates when the spacing groups between the polymer strands are absent of the spacing group increases.

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