Hyperbranched poly(phenylenevinylene) bearing pendant phenoxys for a high-spin alignment

Hiroyuki Nishide, Mitsutaka Nambo, Makoto Miyasaka

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

2,6-Dibromo-4-(3′,5′-di-tert-butyl-4′-acetoxyphenyl)styrene was polymerized in a one-pot reaction using a palladium catalyst, and subsequent hydrolysis and oxidation yielded the hyperbranched poly[(4-(3′,5′-di-tert-butyl-4′-ylooxyphenyl)-1,2,(6)- phenylenevinylene)], which three-directionally satisfies both an alternant but non-Kekulé-type π-conjugation and the ferromagnetic connectivity of the unpaired electrons of the pendant phenoxyl. The AFM image, unusually low solution viscosity, and low chemical reactivity of the phenol group indicated the polymer to have a highly branched and globular structure. In spite of the extremely crowded branching, π-conjugation in the polymer skeleton was maintained, as indicated by photoelectron and EPR spectroscopies. The phenoxyl polymer even with a spin concentration of only 0.4 spin per monomer unit displayed an average S value of 3.

Original languageEnglish
Pages (from-to)3578-3584
Number of pages7
JournalJournal of Materials Chemistry
Volume12
Issue number12
DOIs
Publication statusPublished - 2002 Dec 1

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Bearings (structural)
Polymers
alignment
conjugation
polymers
Chemical reactivity
Styrene
Palladium
Photoelectrons
Phenol
musculoskeletal system
styrenes
phenols
Phenols
Paramagnetic resonance
hydrolysis
palladium
Hydrolysis
reactivity
monomers

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Science(all)
  • Materials Chemistry

Cite this

Hyperbranched poly(phenylenevinylene) bearing pendant phenoxys for a high-spin alignment. / Nishide, Hiroyuki; Nambo, Mitsutaka; Miyasaka, Makoto.

In: Journal of Materials Chemistry, Vol. 12, No. 12, 01.12.2002, p. 3578-3584.

Research output: Contribution to journalArticle

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AB - 2,6-Dibromo-4-(3′,5′-di-tert-butyl-4′-acetoxyphenyl)styrene was polymerized in a one-pot reaction using a palladium catalyst, and subsequent hydrolysis and oxidation yielded the hyperbranched poly[(4-(3′,5′-di-tert-butyl-4′-ylooxyphenyl)-1,2,(6)- phenylenevinylene)], which three-directionally satisfies both an alternant but non-Kekulé-type π-conjugation and the ferromagnetic connectivity of the unpaired electrons of the pendant phenoxyl. The AFM image, unusually low solution viscosity, and low chemical reactivity of the phenol group indicated the polymer to have a highly branched and globular structure. In spite of the extremely crowded branching, π-conjugation in the polymer skeleton was maintained, as indicated by photoelectron and EPR spectroscopies. The phenoxyl polymer even with a spin concentration of only 0.4 spin per monomer unit displayed an average S value of 3.

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