Electrical and magnetic properties of electro-oxidative polymerized poly(tris(thienylphenyl)amine)s

Jun Sang Cho, Kumiko Uchida, Naoki Yoshioka, Kimihisa Yamamoto

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Electro-oxidative polymerized poly(tris(thienylphenyl)amine)s, which have the hyperbranched (dendritic) structure (PTPA) and linear type (PMeTPA), were investigated for their electrical and magnetic properties. The conductivity PTPA showed was almost one order higher than that of PMeTPA. From the solid state ESR measurements of the polymers, observation of ESR signal at g=2.0027 and 2.0030 indicated the formation of a triphenylamine cation radical. The normalized magnetization plots (M/MS) for PTPA and PMeTPA are close to the theoretical Brillouin curves for S=1, indicating a magnetic interaction between the spin centers in PMeTPA. The spin concentrations determined by the M s values of PTPA and PMeTPA were 7.3-7.4 and 1.3-1.4%, respectively. This large difference in the spin concentration of the polymers according to the structure resulted from a different spin conformation by the radical structure.

Original languageEnglish
Pages (from-to)697-701
Number of pages5
JournalScience and Technology of Advanced Materials
Volume5
Issue number5-6
DOIs
Publication statusPublished - 2004 Sep

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Amines
Paramagnetic resonance
Magnetic properties
Polymers
Electric properties
Conformations
Cations
Magnetization
Positive ions

Keywords

  • Dendritic polymer
  • Magnetic property
  • Poly(thienylphenyl)amine
  • Spin concentration

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Electrical and magnetic properties of electro-oxidative polymerized poly(tris(thienylphenyl)amine)s. / Cho, Jun Sang; Uchida, Kumiko; Yoshioka, Naoki; Yamamoto, Kimihisa.

In: Science and Technology of Advanced Materials, Vol. 5, No. 5-6, 09.2004, p. 697-701.

Research output: Contribution to journalArticle

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AU - Uchida, Kumiko

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AU - Yamamoto, Kimihisa

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N2 - Electro-oxidative polymerized poly(tris(thienylphenyl)amine)s, which have the hyperbranched (dendritic) structure (PTPA) and linear type (PMeTPA), were investigated for their electrical and magnetic properties. The conductivity PTPA showed was almost one order higher than that of PMeTPA. From the solid state ESR measurements of the polymers, observation of ESR signal at g=2.0027 and 2.0030 indicated the formation of a triphenylamine cation radical. The normalized magnetization plots (M/MS) for PTPA and PMeTPA are close to the theoretical Brillouin curves for S=1, indicating a magnetic interaction between the spin centers in PMeTPA. The spin concentrations determined by the M s values of PTPA and PMeTPA were 7.3-7.4 and 1.3-1.4%, respectively. This large difference in the spin concentration of the polymers according to the structure resulted from a different spin conformation by the radical structure.

AB - Electro-oxidative polymerized poly(tris(thienylphenyl)amine)s, which have the hyperbranched (dendritic) structure (PTPA) and linear type (PMeTPA), were investigated for their electrical and magnetic properties. The conductivity PTPA showed was almost one order higher than that of PMeTPA. From the solid state ESR measurements of the polymers, observation of ESR signal at g=2.0027 and 2.0030 indicated the formation of a triphenylamine cation radical. The normalized magnetization plots (M/MS) for PTPA and PMeTPA are close to the theoretical Brillouin curves for S=1, indicating a magnetic interaction between the spin centers in PMeTPA. The spin concentrations determined by the M s values of PTPA and PMeTPA were 7.3-7.4 and 1.3-1.4%, respectively. This large difference in the spin concentration of the polymers according to the structure resulted from a different spin conformation by the radical structure.

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