Vacuum UV photochemistry in cyclodextrin cavities. Solid state ZE photoisomerization of a cyclooctene-β-cyclodextrin inclusion complex
| Autor: | Kazuharu Nakagawa, Yoshihisa Inoue, Hiroshi Tsuneishi, Tadao Hakushi, Lin-Hui Tong, Akira Tai, Kaoru Matsumoto, Satoru Kosaka |
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| Rok vydání: | 1993 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Cyclodextrin Photoisomerization Chemistry General Chemical Engineering General Physics and Astronomy General Chemistry Photochemistry Cis trans isomerization Inclusion compound chemistry.chemical_compound Cyclooctene Photostationary state Isomerization |
| Zdroj: | Journal of Photochemistry and Photobiology A: Chemistry. 71:61-64 |
| ISSN: | 1010-6030 |
| DOI: | 10.1016/1010-6030(93)87010-k |
| Popis: | An inclusion complex of (Z)-cyclooctene (1Z) with β-cyclodextrin (β-CD) was synthesized in aqueous solution and shown to be a stoichiometric 1:1 complex by thermogravimetry-differential thermal analysis (TG-DTA) and gas chromatography (GC) analysis. Direct photolysis at 185 nm of the inclusion complex (1Z-β-CD) in the solid state led to reversible ZE isomerization as the major photoreaction, yielding an apparent photostationary state (PSS) ZE mixture on prolonged irradiation. The E to Z ratio obtained at the PSS (0.47) is considerably smaller than that (0.96) reported in direct photolysis in fluid solution. The optical yield of the isolated product (E)- cyclooctene (1E) was low: [α]D25= 1.0°, or 0.24%. |
| Databáze: | OpenAIRE |
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