1996 Fiscal Year Final Research Report Summary
Magnetic Resonance Studies of Spin Solition in 1-D Pt Complexes
| Project/Area Number |
06453055
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
機能・物性・材料
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| Research Institution | University of Tsukuba |
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Principal Investigator |
IKEDA Ryuichi University of Tsukuba, Department of Chemistry, Professor, 化学系, 教授 (90022631)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIMARU Shinichi University of Tsukuba, Department of Chemistry, Assistant, 化学系, 助手 (10251034)
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| Project Period (FY) |
1994 – 1996
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| Keywords | Halogen-Bridged Complex / One-Dimensional Electronic System / Spin Soliton / Mixed-Valence State / Proton Magnetic Relaxation / Paramagnetic Spin |
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| Research Abstract |
We have studied ^1H NMR relaxation of a quasi 1-D mixed valence Pd complex [Pd (chxn) _2] [PdBr_2 (chxn) _2] Br_4 (chxn : cyclohexanediamine), in which the energy gap between Pd (II) and Pd (IV) sites was shown quite small, and revealed the presence of rapid diffusion of electron spins forming kink-type spin solitons from the temperature and frequency dependence measurements of ^1H NMR relaxation time.
In the present study, we selected another type of 1-D system [Pt (en) _2] [PtBr_2 (en) _2] - (ClO_4) _4 (en : ethylenediamine), which is isolated more than in the Pd-chxn complex, but has an larger energy gap. Our interest is how the weaker interactions among chains affects to the formation of solitons. We measured ^1H NMR relaxation and ESR spectra on this Pt-en complex and revealed that paramagnetic Pt (III) sites formed along the chain can diffuse as solitons which concentration is lower than in the Pd-chxn complex, but its diffusion velocity is much faster. This indicates that the 2-D interaction between chains prevents the soliton formation and its migration.
A similar results was obtained in an isolated Pd complex [Pd (en) _2] [PtBr_2 (en) _2] - (ClO_4) _4 which shows rapid diffusion of spin solitons almost the same order as observed in trans-polyacetylene.
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Research Products
(24 results)
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[Publications] K.Inoue, M.Yamashita, T.Furuta, A.Ichikawa, K.Ohishi, H.Okamoto, N.Kimura, H.Ohki, R.Ikeda, S.Bandow, K.Toriumi, T.Mitani, H.Kitagawa and H.Miyamae: "Structural Control of Quasi-One-Dimensional Halogen-Bridged Nickel Complex" Synth.Metals. 71. 1913-1914 (1995)
Description
「研究成果報告書概要(欧文)」より
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