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Conformational transitions and aggregations of regioregular polyalkylthiophenes
Author(s) -
Kiriy Nataliya,
Jähne Evelin,
Kiriy Anton,
Adler HansJuergen
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200450640
Subject(s) - alkyl , molecule , solvent , side chain , polymer , absorption spectroscopy , methanol , spectroscopy , absorption (acoustics) , materials science , polymer chemistry , chemistry , solvent effects , photochemistry , crystallography , organic chemistry , optics , physics , quantum mechanics , composite material
Diverse conformational transitions and aggregations of regioregular poly (3‐alkylthiophene)s (PATs) in different environment have been studied by means of AFM and UV‐vis‐spectroscopy. In methanol, which is a non‐solvent for both alkyl side groups and aromatic backbone at low polymer concentration, PATs chains fold into compact poorly ordered flat structures. At higher polymer concentration PATs molecules undergo 3D aggregation into near spherical particles. In hexane, which is a selective solvent for alkyl side chains, PATs molecules undergo ordered main‐chain collapse followed by 1D aggregation. Concentration‐independent red shift of λmax and good resolved fine vibronic structure in the electronic absorption spectra indicate that planarization occurs on the single‐molecule level.