Temperature-Tuning of Optical Properties and Molecular Aggregation in AnE-PVstat Copolymer Solution
Sprache des Titels:
The correlation between the optical and morphological
properties of an anthracene-containing poly(phenylene ethynylene)-alt-
(phenylenevinylene) statistical copolymer (AnE-PVstat) in solution has been
investigated. As a function of temperature, the molecular aggregation in
chloroform/chlorobenzene (CF:CB) solution was examined by means of
absorbance and photoluminescence measurements. The study of the evolution
of the 0?0 to the 0?1 photoluminescence (PL) ratio with temperature in the
framework of the HJ-aggregate model unveiled the presence of both H- and Jlike
behaviors at room temperature. Upon increasing temperature, the
interchain intermolecular coupling decreases, leading to a dissociation of Haggregates.
Hence, molecular torsions are facilitated, polymer planarity is
reduced, and the intrachain electronic coupling decreases.