One-Dimensional Aggregation of Regioregular Polyalkylthiophenes

摘要: Solvent-induced aggregation of regioregular head-to-tail poly(3-alkylthiophene)s (PATs) have been studied by means AFM and UV−vis spectroscopy. In hexane, which is a good solvent for alkyl side chains but poor polythiophene backbones, PAT molecules undergo ordered main-chain collapse driven solvophobic interaction. Well-pronounced concentration-independent red shift λmax resolved fine vibronic structure in the electronic absorption spectra observed upon addition hexane indicate that planarization occurs on single-molecule level. A helical conformation man chain PATs with 12 thiophene rings per each turn has proposed. At higher concentration collapsed unexpected one-dimensional aggregation. Length particles varies from several nanometers to hundreds can be easily adjusted composition or PATs.