Linear and hyperbranched triphenylamine-based polyarylenevinylenes: a comparative optoelectronic study

摘要

The synthesis of triphenylamine-based polyarylenevinylene with linear and hyperbranched architecture is described. The synthetic route is based on Wittig polycondensation reaction at room temperature using as partners di- or tri-aldehyde of triphenylamine and bis- or tris-phosphonium salts. The polymers are separated as two fractions, one insoluble in chloroform and another one soluble in chloroform and insoluble in methanol. All polymers are obtained mostly in cis configuration, but cis linear polymers are thermally isomerized to corresponding trans structures, while branched structures are more thermally stable and isomerization process was not clearly evidenced. Characterization of the poly- mers was performed using NMR and FT-IR spectroscopy and thermal gravimetric analysis, while the optoelectronic properties were studied by UV-Vis and fluorescence and cyclic voltammetry, and compared with model compounds.