4.6 Article

Solid-solid transition of microcrystalline oligo(phenylene ethynylene)s: Impact of crystalline structure on optoelectronic properties

Journal

CHEMICAL PHYSICS LETTERS
Volume 801, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.cplett.2022.139709

Keywords

Phenylene ethynylene; Conjugated; Solid-solid transition; Electronic conductivity; Aggregate

Funding

  1. Japan Society for the Promotion of Science (JSPS) [P19374]

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In this study, the investigation of conjugated oligomers with distinct chain lengths revealed a unique solid-solid transition only in the pentamer, resulting in uniaxial expansion in the condensed phase. Time-resolved microwave conductivity measurements highlighted the interplay between thermal activation of charge carriers and uniaxial expansion reducing electronic coupling in pi-stacking of adjacent molecules.
Conjugated oligomers with distinct chain lengths, the trimers and pentamers of phenyleneethynylene units, have been investigated in this work with an aim to obtain ordered crystalline phases of the linear chain molecules. As such, we have observed a unique phase transition only in the pentamer. Unlike the case of the crystalline-liquid crystalline phase transition, the pentamer exhibited a unique solid-solid transition with uniaxial expansion in the condensed phase. Time-resolved microwave conductivity measurements suggested an interplay of the thermal activation of charge carriers, which enhanced the hopping probability, and uniaxial expansion reduced the electronic coupling in the pi-stacking of adjacent molecules.

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