Metal-directed asymmetric spatial assembly of diverse building blocks - spheres, planes, and bowls
Publicly Offered Research
Project Area | Coordination Asymmetry: Design of Asymmetric Coordination Sphere and Anisotropic Assembly for the Creation of Functional Molecules |
Project/Area Number |
19H04590
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Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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Allocation Type | Single-year Grants |
Review Section |
Science and Engineering
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Research Institution | Osaka Prefecture University |
Principal Investigator |
プラシデス コスマス 大阪府立大学, 工学(系)研究科(研究院), 教授 (90719006)
|
Project Period (FY) |
2019-04-01 – 2021-03-31
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Project Status |
Completed (Fiscal Year 2020)
|
Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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Keywords | mixed valence / valence transitions / spin frustration / rare earths / fullerides / Asymmetric assembly / pi-electron systems / spherical molecules / planar molecules / bowl-shaped molecules |
Outline of Research at the Start |
The project will develop a new molecular materials platform using metal-dictated asymmetric assembly of spherical, planar and curved nanocarbons into unconventional high-Tc superconductors and quantum magnets. It will fuse molecular solid state chemistry and materials physics and follows two inter-related parts: (A) Asymmetric assembly of electronically active units in dynamically-flexible metal-directed extended structures of variable dimensionality. (B) Employing chemical and physical means to unveil, control and enhance electronic, conducting, and magnetic functionalities.
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Outline of Annual Research Achievements |
Research focused on asymmetrically coordinated (cationogenic and anionogenic) mixed valence molecular solids. Progress was achieved in producing magnetically frustrated spin assemblies and driving insulator-to-metal transitions by valence transitions via the application of external stimuli. [1] The electronic properties of d- and f-shell materials have drawn the bulk of research attention but although unconventional p-electron-based electronic, magnetic and conducting materials are rare, they are a fascinating topic. Among alkali oxides, the molecular sesquioxides A4O6 (A = alkali metal) are of special interest as they are rare examples of binary ionic compounds with molecular dioxygen in two different oxidation states. Our work has unveiled a complex cubic (charge-disordered) to tetragonal (charge-ordered) stability phase space as a function of temperature and pressure together with an intimate link between the lattice geometry and the absence of long-range magnetic ordering, which is suppressed because of geometric frustration. [2] Rare-earth (RE) fullerides are an intriguing family of materials in which RE electronic instabilities couple to the electronic and lattice degrees-of-freedom of the strongly-correlated C60 sublattice. We revealed that the asymmetrically-coordinated mixed-valency (Sm1-xCax)2.75C60 materials show pressure-driven reversible phase transitions accompanied by drastic increases in Sm valence and C60 oxidation state. These are coincident with huge lattice contractions and concomitant insulator-to-metal transitions.
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Research Progress Status |
令和2年度が最終年度であるため、記入しない。
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Strategy for Future Research Activity |
令和2年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(51 results)