| Project/Area Number |
16550126
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Saga University |
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Principal Investigator |
TAKESHITA Michinori Saga University, Department of Chemistry and Applied Chemistry, Associate Professor, 理工学部, 助教授 (40274534)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Keywords | Photochromism / Cylophane / Photomemory / Enantiomer / Non-destructive read-out / Optical resolution / Refractive index / Photoreversible / 光学活性 / 分子機械 / ジァリールエテン / 光メモリー材料 / 調光材料 / 立体特異的反応 |
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| Research Abstract |
Dithia-(dithienylethena)phane derivatives, composed of dithienylethene moieties and benzene bridges, were synthesized by a coupling reaction of the corresponding bis(chloromethyl)benzene with bis(mercaptomethyl)dithienylethene under high-dilution conditions. The products exhibit photochromic properties upon irradiation with ultraviolet and visible light. The photocyclization and cycloreversion quantum yields were determined, and a relationship between the photocyclization quantum yield and distance between the reactive carbon atoms of the phane derivatives established. The ortho isomer has a high efficiency in photocyclization due to its fixation in the photo-active anti conformation and short distance between the two reactive carbon atoms. The thermal stability of these photochromic compounds has been studied and the ortho isomer found to show thermal irreversibility.
Photochromic [2.2]metacyclophan-1-ene in a PMMA (polymethylmethacryate) film reversibly changed the refractive index, which was estimated by ellipsometric analysis. For example, the refractive indexes of the open form and the photostationary state at 352 nm in PMMA films (10.6%) were 1.4934 and 1.4996 at 901.82nm, respectively, and the variation (Δn) was 0.0062. The calculated refractive indexes of the open and closed forms were 1.744 and 1.859, respectively. The refractive index of the PMMA film containing a photochromic dye changed photoreversibly due the photochromic reaction between the open and closed forms of [2.2]metacyclophan-1-ene.
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