Preparation of Poly(2,5-diheptyl-1,4-phenylenevinylene) by Sulfonium Salt Pyrolysis

Article abstract of DOI:10.1246/bcsj.65.853

Poly(2,5-diheptyl-1,4-phenylenevinylene) (1) was prepared by the sulfonium salt pyrolysis procedure.Tough films of 1 were obtained by pyrolysis of its sulfonium salt precursor film.Due to flexible side chains, 1 was soluble in organic solvents such as chloroform.The molecular weights were M_n=3.8-4.7*10⁴ and M_w=1.4-1.8*10⁵.The ratio of trans to cis olefinic units was found to be 93:7 from the 1H NMR spectrum.Two arylmethylene peaks suggested that there were two kinds of stereochemically different methylene groups.Although the peak energy in the absorption spectra was almost identical to those of poly(1,4-phenylenevinylene) (PPV), the electrical conductivity of 1 was much lower than that of PPV.