| Project/Area Number |
17350067
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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 |
Functional materials chemistry
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| Research Institution | Shizuoka University |
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Principal Investigator |
KOBAYASHI Kenji Shizuoka University, Graduate School of Science and Technology, Professor (40225503)
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| Co-Investigator(Kenkyū-buntansha) |
YAMANAKA Masamichi Shizuoka University, Faculty of Science, Assistant Professor (10377715)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥15,040,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥840,000)
Fiscal Year 2007: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2006: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2005: ¥6,900,000 (Direct Cost: ¥6,900,000)
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| Keywords | Molecular Self-Assembly / Capsule / Unsymmetrical Nano-Space / Supramolecule / Host-Guest / Molecular Recognition / Encapsulation / Control of Orientation / ホスト-ゲスト |
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| Research Abstract |
We studied on the construction and elucidation of functions of unsymmetrical molecular capsules self-assembled by hydrogen bonds or metal-coordinations. Our findings in this study are as follows.
(1) We synthesized bowl-shaped cavitands 1〜7 with hydrogen-bonding sites or metal-coordination sites. We found that 1 and 3, 4 and 5, and 4, 6, and Pd(dppp)(OTf)_2, self-assemble into hydrogen-bonded heterocapsules 1・3 and 4・5, and metal-coordination heterocapsule 4・6・4[Pd(dppp)]^(8+), respectively.
(2) We found that these heterocapsules encapsulate unsymmetrical guests with high orientational selectivity what is called "orientational isomerism".
(3) The structural and/or electronic environments of one half-capsule unit of the heterocapsule are different from those of the other half-capsule unit. We found that the delicate balance among electrostatic potential repulsion between the lone pair of the carbonyl oxygen atom of a guest and the aromatic cavity of a cavitand, attractive CH-πinteraction, or attractive CH-halogen (halogen-π) interaction in a heterocapsule-guest assembly influences the orientational isomeric selectivity of unsymmetrical guests within heterocapsule.
(4) Fine and/or drastic tuning of capsule space has been attained by alteration of the hydrogen-bonding linker and/or hemispherical cavitand, respectively.
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