Syntheses, optical and electrochemical properties of 4,4′-bis-[2-(3,4-dibutyl-2-thienylethynyl)lbiphenyl and its oligomers

New pi-conjugated oligomers (1-3) combined of thiophene rings, C C units, and phenylene rings were synthesized. The monomer (1) was synthesized by Sonogashira cross-coupling reaction. Lithiation and oxidation of the monomer led to the formation of dimer (2) and trimer (3). Optical and electrochemical properties of compounds 1-3 were studied. The oligomers with thioacetyl moieties were synthesized for self-assembly. (c) 2005 Elsevier Ltd. All rights reserved.