| Project/Area Number |
09305060
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
高分子合成
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| Research Institution | Waseda University |
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Principal Investigator |
NISHIDE Hiroyuki Waseda University, School of Science and Engineering, Professor, 理工学部, 教授 (90120930)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Masahiro Waseda University, JSPS. Research Fellow, 特別研究員 (20298178)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥31,700,000 (Direct Cost: ¥31,700,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1998: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1997: ¥27,000,000 (Direct Cost: ¥27,000,000)
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| Keywords | Conjugated Polymer / Precision Polymerization / Polycondensation / Polyradical / High-Spin Polymer / Magnetic Polymer |
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| Research Abstract |
Objectives of this research are the synthesis of π-conjugated polymers bearing pendant radical groups on every monomer unit, which are substituted on the polymer backbone to satisfy a π-conjugated but non-Kelule structure, and the study on strong and through-bond ferromagnetic exchange interaction between and alignment of the multiple spins of the pendant radicals.
(1) Bromostyrene dirivatives were polycondensated with a Pd-phosphine catalyst to yield π-conjugated star-shaped or hyperbranched poly (4-phenoxyl-1, 2-phenylenevinylene) s. SQUID and pulsed ESR measurements revealed the spin-alignment, e. g., with S = 10/2.
(2) Linear, acyclic, and cyclic poly (phenoxy-phenyleneethynylene) s were synthesized by the polycondensation of the iodostyrene derivatives with a Pd/Cu catalyst. The cyclic and conjugated one was an effective spin pathway.
(3) Diphenylaminium cation radical was introduced as a spin source to poly (4-substituted 1, 2-phenylenevinylene) to realize both a sufficient ferromagnetic interaction and chemical stability even at room temperature. Stability of the multiplet ground state was significantly large to first give a highspin and durable organic polymer.
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