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Polymerization of (p-vinylphenyl)hydrogalvinoxyl and formation of a stable polyradical derivative

✍ Scribed by Takashi Kaneko; Hiroyuki Tatsumi; Toshiki Aoki; Eizo Oikawa; Hajime Yoshiki; Naoki Yoshioka; Eishun Tsuchida; Hiroyuki Nishide

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 194 KB
Volume: 37
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(19990115)37:2<189::aid-pola9>3.0.co;2-z

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✦ Synopsis

4-[(3,5-Di-tert-butyl-4-hydroxyphenyl)

(3,5-di-tert-butyl-4-oxo-cyclohexa-2,5-dienylidene)methyl]styrene (abbreviated as (p-vinylphenyl)hydrogalvinoxyl) was polymerized using AIBN as an initiator to give a bright yellow polymer with M w ϭ 3.2 ϫ 10 4 . The polymer was oxidized to give the corresponding polyradical derivative, whose spin concentration could be increased up to about 70 mol % depending on oxidative conditions. ESR signal line-width in the solid state was greatly increased below 200 K for the polyradical with a high spin concentration (Ͼ 50 mol %). The magnetization and magnetic susceptibility indicated weak antiferromagnetic interaction among the radical sites.

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