Solid-state optical and structural modifications induced by temperature in a chiral poly-3-alkylthiophene

Polyalkylthiophenes bearing enantiomerically pure side chains are noncentrosymmetric
materials that can be used in polarized photo- and electroluminescence areas and enantioselective
sensing. In this work we present the characterization of a polyalkylthiophene with
a chiral center very close to the conjugated backbone: poly-3-(S)-2-methylbutylthiophene
(PMBT). Differential scanning calorimetry and X-ray diffraction measurements have been
performed to characterize the thermal transitions and the structural organization of this
polymer. Thin films of PMBT exhibit interesting thermochromism phenomena that affect
absorption, emission, and circular dichroism properties. The influences of both the film
processing and the thermal treatment on the conjugated polymeric chains have been studied
by UV-visible, FTIR, and Raman spectroscopies. Thermochromism has been monitored by
in situ electronic absorption, circular dichroism, and photoluminescence experiments.
Electroluminescence properties and the electrical characterization of a single-layer lightemitting
diode are also presented. The optical and structural changes induced by the
temperature are discussed in terms of the peculiar three-dimensional order found for this
polymer with respect to other poly-3-alkylthiophenes.