The temperature dependence of the UV–VIS absorption maximum of alkyl tetrasubstituted sexithiophene and poly(dialkylterthiophene) have been investigated, and the results are consistent with a rotation of the main conjugated chain induced by an increase of disorder in the side chains upon heating.
K. Faïd and M. Leclerc, J. Chem. Soc., Chem. Commun., 1993, 962 DOI: 10.1039/C39930000962
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