Ladderlike ferromagnetic spin coupling network on a π-conjugated pendant polyradical

Takashi Kaneko, Takahisa Makino, Hiroshi Miyaji, Masahiro Teraguchi, Toshiki Aoki, Makoto Miyasaka, Hiroyuki Nishide

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

A poly(9,10-anthryleneethynylene)-based polyradical with two pendant stable phenoxyls in one anthracene skeleton was newly synthesized via polymerization of the corresponding bromoethynylanthracene monomer using a Pd(0) catalyst. The average molecular weight of the polymer reached M̄n = 5 × 103 and was soluble in common organic solvents. The polyradical was prepared from the corresponding hydroxyl precursor polymer and was appropriately stable at room temperature. The ESR spectrum of the corresponding monomeric radical suggested an effectively delocalized spin density distribution on the backbone anthracene. The magnetization and the static magnetic susceptibility of the polyradical were measured using a SQUID magnetometer. The large average spin quantum number (S̄ = 5/2) of the polyradical indicated that the ferromagnetic spin coupling network of the polyradical had spread throughout the π-conjugated chain and that it was considerably insensitive to spin defects.

Original languageEnglish
Pages (from-to)3554-3557
Number of pages4
JournalJournal of the American Chemical Society
Volume125
Issue number12
DOIs
Publication statusPublished - 2003 Mar 26

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Anthracene
Polymers
SQUIDs
Magnetometers
Magnetic susceptibility
Skeleton
Polymerization
Hydroxyl Radical
Organic solvents
Paramagnetic resonance
Magnetization
Monomers
Molecular Weight
Molecular weight
Defects
Catalysts
Temperature
anthracene

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Ladderlike ferromagnetic spin coupling network on a π-conjugated pendant polyradical. / Kaneko, Takashi; Makino, Takahisa; Miyaji, Hiroshi; Teraguchi, Masahiro; Aoki, Toshiki; Miyasaka, Makoto; Nishide, Hiroyuki.

In: Journal of the American Chemical Society, Vol. 125, No. 12, 26.03.2003, p. 3554-3557.

Research output: Contribution to journalArticle

Kaneko, Takashi ; Makino, Takahisa ; Miyaji, Hiroshi ; Teraguchi, Masahiro ; Aoki, Toshiki ; Miyasaka, Makoto ; Nishide, Hiroyuki. / Ladderlike ferromagnetic spin coupling network on a π-conjugated pendant polyradical. In: Journal of the American Chemical Society. 2003 ; Vol. 125, No. 12. pp. 3554-3557.
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