Abstract
Poly[2-{bis(4-methoxyphenyl)amino}phenyl-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] 1 was prepared via the Gilch reaction of the p-bis(chloromethyl)benzene monomer, 2-{bis(4-methoxyphenyl)aminophenyl}-α,α′-dichloro-p-xylene. The Gilch reaction facilitated the preparation of the polyphenylenevinylene with a triarylamine pendant group when compared to that via the Heck polycondensation. The molecular weight of the polymer was approximately 4.0×105, and it was soluble in common solvents and was reversibly redoxed due to the pendant arylamine moiety. Chemical oxidation of 1 afforded the corresponding aminium polyradical 1+ with the half life-time of ca. 2 weeks under ambient conditions. ESR and magnetization measurements of 1+ revealed a forbidden multiplet signal and an average spin quantum number (S) of 3/2 at low temperature, respectively. The polyradical 1+ was the first example of a high molecular weight, high-spin organic polymer with solvent-solubility and film formability. 2,3-Bis[N,N-bis(4-methoxyphenyl)aminophenyl]stilbene 2 and its aminium diradical 2+ were also prepared as the model dimer compounds; 2+ was a triplet molecule at low temperature. The effect of the π-conjugated poly(1,4-phenylenevinylene) backbone on the high-spin alignment was also discussed.
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Kurata, T., Pu, YJ. & Nishide, H. Triarylamine-Bearing Poly(1,4-phenylenevinylene): Facile Preparation and Its Durable Aminium Polyradical. Polym J 39, 675–683 (2007). https://doi.org/10.1295/polymj.PJ2006226
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DOI: https://doi.org/10.1295/polymj.PJ2006226