Induced circular dichroism spectra of 2-(2,4,6-cycloheptatrien-1-ylidene)-4-cyclopentene-1,3-dione included inβ-cyclodextrin |
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Authors: | Miwako Higashi Hiroyuki Yamaguchi Masaji Oda |
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Institution: | 1. College of Technology, Ibaraki University, 4-12-1 Nakanarusawa, 316, Hitachi, Japan 2. Department of Chemistry, Faculty of Science, Osaka University, 560, Toyonaka, Osaka, Japan
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Abstract: | The assignment of the absorption spectra of 2-(2,4,6-cycloheptatrien-1-ylidene)-4-cyclopentene-1,3-dione (1) is reported by measuring the induced circular dichroism spectra of the β-cyclodextrin complex with1. It is concluded from the signs of the induced circular dichroism bands that the first absorption band (17.1×103–34.3×103 cm?1) is composed of three electronic transitions having perpendicular, parallel and perpendicular polarizations with respect to the long axis (z) of1. The second absorption band (34.3×103–42.8×103 cm?1) is composed of two electronic transitions having parallel polarizations with respect to the long axis of1 and the third absorption band (42.8×103–47.1×103 cm?1) has the transition dipole moment perpendicular to the long axis of1. Our experimental assignments are supported by CNDO/S CI calculations. |
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