| Project/Area Number |
08455400
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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 |
工業物理化学
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| Research Institution | TOKYO METROPOLITAN UNIVERSITY |
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Principal Investigator |
IYODA Tomokazu TOKYO METROPOLITAN UNIVERSITY Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (90168534)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Takehiko TOKYO METROPOLITAN UNIVERSITY Graduate School of Engineering, Associate Professo, 大学院・工学研究科, 助教授 (50087300)
KAWAI Tadashi TOKYO METROPOLITAN UNIVERSITY Graduate School of Engineering, Associate Professo, 大学院・工学研究科, 助教授 (00087298)
長井 圭治 (財)神奈川科学技術アカデミー, 橋本プロジェクト, 研究員 (30280803)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥5,300,000 (Direct Cost: ¥5,300,000)
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| Keywords | Mixed Valence State / Functional Isonitrile / Multi-nuclear Metal Complex / Spin System / Prussian Blue / Soft-Hard Magnetic Phase Transition / Porphyrin / Phase Transition / ポルシアンブルー / プルフィリン / 分子性磁性 / 一次元白金錯体 / 結晶磁気異方性 / 多核シアナイド金属錯体 |
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| Research Abstract |
The objective in this study is to replace cyanide ligands of mixed valence polynuclear metal complexes with specific electric, magnetic, and optical properties by functional isonitrile ligands which have potential to provide another functionality. In this fiscal year, structural phase transition of molecular arrangement on a single crystal of one-dimensional platinum complex with high electric conductivity.
(1) Molecular-resolution images of an electrochemically prepared single crystal of potassium tetracyanoplatinate bromide complex (KCP(Br)) were recorded by atomic force microscopy (AFM) during a tip-induced surface modification process in which the probing tip scraped off the topmost surface layr by layr. Two kinds of molecular images on the (010) face of the KCP(Br) crystal correspond to alternate layred structures consisting of tetracyanoplatinate layrs and interstitial ions. One molecular arrangement was assigned to cyanide ligands and interstitial K^+ and Br^- ions, in good agree
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ment with that obtained from X-ray diffraction. The other corresponds to rearranged interstitial ion (K^+ and Br^-) layr.
(2) Molecular-resolution images by atomic force microscopy (AFM) revealed reversible ordering-disordering transition of molecular arrangements on the (010) face of a single crystal of potassium tetracyanoplatinate bromide (KCP(Br)) during dehydration and hydration treatments. The intracolumnar Pt-Pt distance along c-axis in the dehydrated crystal lengthens by a factor of 30% with considerable disordering, and the re-hydrated crystal shows well-ordered arrangement like the as-grown crystal, while the intercolumnar structures along the orthogonal direction is not varied. In large-scale AFM images showed that the monolayr terraces reversibly slides in the c-axis direction during the dehydration-hydration treatments, reflecting the molecular dislocation along c-axis. These surface structural change is quite consistent with well-known dehydration effect in KCP(Br) crystal, i.e., the lattice disordering and the decreasing conductivity. Less
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