Abstract

A novel polythiophene bearing a pendant terpyridine moiety has been synthesized by electrochemical polymerization of a new thiophene monomer, namely 4'-(2,2':5',2''-terthien-3'-ethynyl)-2,2':6',2''-terpyridine (TAT). The insertion of a conjugated ethynyl spacer between the terthiophene and the terpyridine fragments provides for an effective extension of the delocalization of electrons within the structural unit and the polymer as a whole. The synthesis and characterization of the relevant monomer, the electrosynthesis of the corresponding polymer and its electrochemical, UV–visible spectroelectrochemical and IR characterization are described. Finally, a comparison between the electrochemical, spectroscopic, and spectroelectrochemical properties of PTAT and the analogue, saturated-spacer PTTT (TTT = 4'-[(2,2':5',2''-terthien-3'-yl)methoxy]-2,2':6',2''-terpyridine) polymer is discussed.

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