2001 Fiscal Year Final Research Report Summary
Development of Optically Functionalized Materials based on Giant Porphyrin Arrays
| Project/Area Number |
12440196
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
OSUKA Atsuhiro Kyoto University, Graduate School of Science, Professor, 理学研究科, 教授 (80127886)
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| Project Period (FY) |
2000 – 2001
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| Keywords | porphyrin array / meso-meso linked porphyrin arrays / monodisperse giant molecule / molecular wire / porphyrin sheet / ポルフィリンシート |
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| Research Abstract |
1) We have prepared a series of meso-meso linked diporphyrins strapped with variable length dioxymethylene group. These diporphyrins exhibit systematic spectral changes upon the decrease in the dihedral angle. Two-bands shape Soret band in non-strapped diporphyrins changes into four-bands shape Soret band.
2) Discrete 1024-mer of meso-meso linked porphyrin arrays has been prepared and characterized, which is by far the longest man-made dicrete molecule. It is to be noted that even l-240mer is certainly soluble in organic solvents and can be manipulated.
3) Oxidation with Sc(OTf)_3 and DDQ realized very efficient transformation of end-phenyl capped meso-meso linked porphyrin arrays to triply-linked conjugated porphyrin arrays. The absorption spectra of these conjugated 6-mer, 8-mer and 12-mer display the electronic absorption band deep into infrared region up to 1500cm^<-1>.
4) Starting from 5,10-diaryl metalloporphyrin, conjugated rectangular-shaped porphyrin sheets have been prepared in 10-15% yields, which have 2-dimensionally expanded π-network.
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[Publications] A. Nakano, A. Osuka, T. Yamazaki, Y. Nishimura, S. Akimoto, I. Yamazaki, A. Itaya, M. Murakami, and H. Miyasaka: "Modified Windmill Porphyrin Arrays : Coupled Light-Harvesting and Charge Separation, Conformational Relaxation, and S_2-S_2 Energy Transfer"Chem. Eur. J.. 7. 3134-3151 (2000)
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