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Structure‐Dependent Photophysics Studied in Single Molecules of Polythiophene Derivatives
Author(s) -
Sugimoto Toshikazu,
Ebihara Yohei,
Ogino Kenji,
Vacha Martin
Publication year - 2007
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200700277
Subject(s) - polythiophene , molecule , polymer , photochemistry , polystyrene , photobleaching , chemistry , copolymer , conjugated system , fluorescence , materials science , polymer chemistry , conductive polymer , organic chemistry , physics , quantum mechanics
We report on the photophysical characterization at the single‐molecule level of a graft copolymer consisting of a polythiophene backbone and long polystyrene branches. The presence of the branches prevents the polymer chain from forming a collapsed conformational state. The photophysical properties of the resulting solution‐like conformation are studied by measuring single‐molecule photobleaching dynamics, emission polarization anisotropy and emission spectra. The results are compared with those obtained on the same polythiophene derivative without the branches. It is found that the presence of the branches is a decisive factor in determining the photophysical properties of the polymers on the single‐molecule level.