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Photoexcitations in Oligothiophenes: The Role of Conformation Mobility and Intermolecular Interactions.

Published online by Cambridge University Press:  21 March 2011

Chiara Botta
Affiliation:
Istituto di Chimica delle Macromolecole, CNR, Via Bassini 15, 20133 Milano, Italy
Silvia Destri
Affiliation:
Istituto di Chimica delle Macromolecole, CNR, Via Bassini 15, 20133 Milano, Italy
William Porzio
Affiliation:
Istituto di Chimica delle Macromolecole, CNR, Via Bassini 15, 20133 Milano, Italy
Gianni Bongiovanni
Affiliation:
Istituto Nazionale di Fisica della Materia and Dipartimento di Scienze Fisiche, Universitàdi Cagliari, S.P. Monserrato-Sestu km 0.7, 09042 Monserrato (Ca), Italy
Andrea Mura
Affiliation:
Istituto Nazionale di Fisica della Materia and Dipartimento di Scienze Fisiche, Universitàdi Cagliari, S.P. Monserrato-Sestu km 0.7, 09042 Monserrato (Ca), Italy
Maria A. Loi
Affiliation:
Istituto Nazionale di Fisica della Materia and Dipartimento di Scienze Fisiche, Universitàdi Cagliari, S.P. Monserrato-Sestu km 0.7, 09042 Monserrato (Ca), Italy
Francis Garnier
Affiliation:
Laboratoire des Matériaux Moléculaires, CNRS, 2 rue Henry-Dunant, 94320 Thiais, France
Riccardo Tubino
Affiliation:
Istituto Nazionale di Fisica della Materia and Dipartimento di Scienza dei Materiali, Universitàdi Milano “Bicocca”, via Cozzi 53, 20125 Milano, Italy
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Abstract

The optical properties of substituted and unsubstituted oligothiophenes are analysed with respect to their supramolecular organization in the solid state. The spectra typical of the isolated molecules are obtained by reducing the intermolecular interactions by both lateral chain substitution and by inclusion in a host organic crystal. The photophysical properties of the weakly interacting oligothiophenes are strongly influenced by their backbone conformation and conformational mobility. Oligomers included in the channels of a guest crystal show fast torsional relaxation processes during the photoexcitation. Powders of β-substituted oligomers display optical properties dependent on the conformation of their particular chain packing arrangement.

Type
Research Article
Copyright
Copyright © Materials Research Society 1999

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