2016 Fiscal Year Annual Research Report
柔軟な多孔性結晶を舞台としたドナー／アクセプター配列の動的制御
| Project/Area Number |
15F15339
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| Research Institution | The University of Tokyo |
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Principal Investigator |
佐藤 弘志 東京大学, 大学院工学系研究科(工学部), 講師 (20598586)
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| Co-Investigator(Kenkyū-buntansha) |
AU KA MAN 東京大学, 大学院工学系研究科(工学部), 外国人特別研究員
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| Project Period (FY) |
2015-11-09 – 2018-03-31
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| Keywords | porous materials / metal-organic frameworks / radical |
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| Outline of Annual Research Achievements |
In the past year, continuous efforts have been made to synthesize new types of metal-organic frameworks (MOFs) that contained both electron-donating and accepting moieties. Using donor ligands derived from anthracene and naphthalene, a class of cadmium(II) MOFs has been successfully synthesized and characterized. Careful optimization of the synthetic conditions has resulted in the preparation of single crystals, allowing the observation of the structure and packing of the MOFs via X-ray diffraction studies. Upon variation of the nature of the ligands as well as fine-tuning of the solvents for the synthesis, different arrangements and packing in the crystal structures of the MOFs, ranging from two-dimensional structures to three-dimensional interpenetrated networks, have been successfully obtained. It is interesting to observe that in all of the MOF structures, the donor and acceptor groups are arranged in a cofacial fashion with slight π-π stacking interactions between adjacent moieties.
In addition, the photochemical properties of the MOFs have been investigated in detail. In the solid-state absorption spectra, the MOFs were observed to show a lower-energy absorption band originated from the intraligand transition, as well as a higher-energy band tentatively assigned to originate from intramolecular charge transfer. Preliminary studies with flash-photolysis time-resolved microwave conductivity (FR-TRMC) experiments revealed that the porous materials are photoconductive in nature.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
刺激応答性、具体的には湿度に応答する多孔性材料を合成することに成功し、その応答機構の解明に挑戦している。このような結果は新たな材料機能設計指針を与える重要な知見である。
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| Strategy for Future Research Activity |
In the remaining period of the JSPS Fellowship, I would like to further investigate and confirm the photochemical behaviors of the MOFs. Detailed studies on the electron-conducting properties of the MOFs will be conducted by TRMC. Time-resolved transient absorption studies as well as kinetic studies will also be performed to get an insight into the lifetime of the charge transfer processes. Careful analysis of the results will be conducted to rationalize the underlying mechanism as well as to understand the structure-property relationship of these porous materials. A manuscript will be written based on these findings and will be submitted for publication.
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Research Products
(1 results)
