Synthesis and magnetic properties of conjugated stable polyradicals

Hiroyuki Nishide, Naoki Yoshioka, Takahiko Kaku, Takashi Kaneko, Masanori Yamazaki, Eishun Tsuchida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Synthesis and magnetic properties of π-conjugated stable polyradicals bearing a polyacetylene backbone are described. 2,6-Di-tert-butyl-4-ethynylphenol (8) and 4-ethynylphenylhydrogalvinoxyl (9) are polymerized with W, Mo chloride or Rh complex to yield their polyacetylene derivatives with molecular weight of ca. 104, while 2-ethynylphenalenone (10) gives only its oligomer. The polymers are soluble in common solvents and converted to the corresponding conjugated polyradicals via heterogeneous chemical oxidation using PbO2 or alkaline K3Fe(CN)6. The polyradicals with extremely high spin concentration (up to 4.8 x 1023 spins/monomer mol) are obtained by regulating the oxidative conditions. The polyradicals are quite stable in solution and even in the solid state because of resonance stabilization and/or a steric effect of the substituents. Magnetic interactions between the unpaired spins in the conjugated stable polyradicals are discussed.

Original languageEnglish
Pages (from-to)1177-1187
Number of pages11
JournalJournal of Macromolecular Science: Part A - Chemistry
Volume28
Issue number11-12
DOIs
Publication statusPublished - 1991 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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