1999 Fiscal Year Final Research Report Summary
SIMULATION OF COLOR TUNING AND PHOTOISOMERIZATION OF PROTONATED RECHINAL SCHIFF BASE IN MODIFIED CLAY INTERLAYERS AND ITS APPLICATION TO PHOTOSENSITIVE MATERIALS
| Project/Area Number |
10450325
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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 | Tokai University |
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Principal Investigator |
SASAKI Masako TOKAI UNIV., RESEARCH INST. OF SCI & TEC., PROFESSOR, 総合科学技術研究所, 教授 (00090514)
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| Co-Investigator(Kenkyū-buntansha) |
WAKAI Moriaki TOKAI UNIV., SCHOOL OF ENGINEERING, PROFESSOR, 工学部, 教授 (20100993)
KANDORI Hideki KYOTO UNIV., DEP. BIOPHYSICS, LECTURER, 大学院・理学研究科, 講師 (70202033)
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| Project Period (FY) |
1998 – 1999
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| Keywords | retinal / montmorillonite / Schiff base / cationic surfactant / modified clay interlayers / photoisomerization / photosensitive material / retinal Schiff base |
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| Research Abstract |
Retinal is the chromophore in the vision process. Ultra fast and reversible visual response in the human eye covering the broad visible wavelength range of 400-800 nm can be achieved by the protonation of the retinal Schiff base (RSB) in protein-opsin, We have found that clay acts as a novel model matrix for the amphiphilic protein-opsin environment to mimic the visible absorption spectrum of protonated RSB in vivoィイD11)ィエD1.
In this study there are two aims for examination. The first is control of color tuning and production of reversible photoisomerization of protonated RSB in modified clay interlayers, and the second is development of new photosensitive materials by mimicry of ultra fast vision process.
Montmorillonite (MONT) was used as the model matrix for protein-opsin. MONT interlayers were changed to amphiphilic space by ion-exchange from metal ion to cationic surfactants, Two model matrices were prepared, and color tuning of protonated RSB from 400 nm to 600 nm was achieved without strong acids at room temperature. Rhodopsin-like photoisomerization of protonated 11-cis RSB to all-trans RSB was obtained with high efficiency in the modified MONT interlayers. Non-linear optical function of all-trans RSB in the modified MONT layers (RSB-MONT) was examined, and primary non-linear response of the RSB-MONT was observed.
In conclusion, modified MONT provides a suitable model matrix for mimicry of the role of the protein-opsin environment. Rhodopsin-like color tuning and photoisomerization of protonated RSB in modified MONT was achieved. The possibility of non-lincar optical material of RSB-MONT was suggested.
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