Synthesis of and ferromagnetic coupling in poly(phenylenevinylene)s bearing built-in t-butyl nitroxides

Hiroyuki Nishide, Takashi Kaneko, Shuichi Toriu, Yoshihiro Kuzumaki, Eishun Tsuchida

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Abstract

Poly[[2- or 4-[N-t-butyl-N-(triethylsiloxy- or t-butyldimethylsiloxy)amino]-1,4- or 1,2-phenylene]vinylene] was synthesized by polymerizing 4- or 2-bromo-2- or 4-[N-t-butyl-N-(triethylsiloxy- or t-butyldimethylsiloxy)amino]styrene with a palladium catalyst, respectively. They were deprotected and chemically oxidized to yield poly(1,4- or 1,2-phenylenevinylene)s bearing a 2- or 4-substituted built-in nitroxide radical. The polyradicals were chemically stable, and their spin concentration was increased to 0.8 spin/unit. A SQUID measurement which included the corresponding diradicals and triradicals indicated that a partial, but strong, intramolecular ferromagnetic coupling was established through the conjugated backbone, despite a spin defect in the side radical moiety, for the poly(1,2- phenylenevinylene) bearing 4-substituted built-in nitroxide radical.

Original languageEnglish
Pages (from-to)499-508
Number of pages10
JournalBulletin of the Chemical Society of Japan
Volume69
Issue number2
Publication statusPublished - 1996 Feb

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Bearings (structural)
Styrene
SQUIDs
Palladium
Defects
Catalysts
nitroxyl

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Synthesis of and ferromagnetic coupling in poly(phenylenevinylene)s bearing built-in t-butyl nitroxides. / Nishide, Hiroyuki; Kaneko, Takashi; Toriu, Shuichi; Kuzumaki, Yoshihiro; Tsuchida, Eishun.

In: Bulletin of the Chemical Society of Japan, Vol. 69, No. 2, 02.1996, p. 499-508.

Research output: Contribution to journalArticle

Nishide, Hiroyuki ; Kaneko, Takashi ; Toriu, Shuichi ; Kuzumaki, Yoshihiro ; Tsuchida, Eishun. / Synthesis of and ferromagnetic coupling in poly(phenylenevinylene)s bearing built-in t-butyl nitroxides. In: Bulletin of the Chemical Society of Japan. 1996 ; Vol. 69, No. 2. pp. 499-508.
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AB - Poly[[2- or 4-[N-t-butyl-N-(triethylsiloxy- or t-butyldimethylsiloxy)amino]-1,4- or 1,2-phenylene]vinylene] was synthesized by polymerizing 4- or 2-bromo-2- or 4-[N-t-butyl-N-(triethylsiloxy- or t-butyldimethylsiloxy)amino]styrene with a palladium catalyst, respectively. They were deprotected and chemically oxidized to yield poly(1,4- or 1,2-phenylenevinylene)s bearing a 2- or 4-substituted built-in nitroxide radical. The polyradicals were chemically stable, and their spin concentration was increased to 0.8 spin/unit. A SQUID measurement which included the corresponding diradicals and triradicals indicated that a partial, but strong, intramolecular ferromagnetic coupling was established through the conjugated backbone, despite a spin defect in the side radical moiety, for the poly(1,2- phenylenevinylene) bearing 4-substituted built-in nitroxide radical.

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