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Synthesis of Heterocyclic Monomers Designed to Produce Conducting Polymer with Specific Redox Requisites and to Evaluate Stereochemical Factors Influencing the Conductivity

Published online by Cambridge University Press:  25 February 2011

Anna Berlin ,
Elisabetta Brenna ,
Giorgio. A. Pagani ,
Franco Sannicolo ,
Gianni Zotti  and
Gilberto Schiavon
Anna Berlin
Affiliation:
Dipartimento di Chimica Organica e Industriale dell', Università di Milano, via e. Golgi 19, Milano, Italy
Elisabetta Brenna
Affiliation:
Dipartimento di Chimica Organica e Industriale dell', Università di Milano, via e. Golgi 19, Milano, Italy
Giorgio. A. Pagani
Affiliation:
Dipartimento di Chimica Organica e Industriale dell', Università di Milano, via e. Golgi 19, Milano, Italy
Franco Sannicolo
Affiliation:
Dipartimento di Chimica Organica e Industriale dell', Università di Milano, via e. Golgi 19, Milano, Italy
Gianni Zotti
Affiliation:
Istituto di Polarografia ed Elettrochimica Preparativa del CNR, C.so Stati Uniti 4, Padova.
Gilberto Schiavon
Affiliation:
Istituto di Polarografia ed Elettrochimica Preparativa del CNR, C.so Stati Uniti 4, Padova.
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Abstract

According to the “spacer” strategy we have previously proposed the monomers candidate for providing conductive polymers endowed with special properties should contain the polymerogenic rings (pyrrole or thiophene), as terminal units, linked to a central π-conjugatively active frame; we describe how it is possible in this way to control the redox potentials E of the polymers derived from such monomers. This control is beneficial because it is possible to increase the E° value of polypyrrole-type systems and decreases the E° value of polythiophene-type systems. Also, the “spacer”may be further functionalised and, being remote from the polymerisation site, cannot alter the conductivity characteristics typical of the polymer derived from the parent heterocycle (pyrrole or thiophene): such a functionalisation may provide the final, tailored, conductive polymer with special properties (e.g. solubility). If the central ring, acting as a spacer, is formed linking two positions of a di-heterocycle with a saturated chain, it is possible to partially control the twist angle between the heterocyclic units. Crystal and molecular structures have shown that dipyrrole units further linked through the nitrogen atoms are quite sensitive to the central ring size. With respect to the conductivity of unsubstituted polypyrrolc, the conductivity of the polymers derived from such monomers is dependent from the twist angle between the rings. This result is relevant to describe conditions of conjugation between the heterocyclic units of a monomer required to produce upon doping a conductive polymer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 619
Copyright
Copyright © Materials Research Society 1992

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References

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