✦ LIBER ✦
Photoisomerization of norbornadiene group in a rigid bichromophoric compound initiated by remote keto chromophore: long-distance through-bond triplet energy transfer
✍ Scribed by Tung Chen-Ho; Zhang Li-Ping; Li Yi
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 294 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0256-7660
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✦ Synopsis
Abstract
A diad compound 3β(bicyclo[2,2,1]hepta‐2,5‐diene‐2‐methylcarboxylate‐3‐carboxy)‐an‐drost‐5‐en‐17‐one (NBD‐S‐ONE) was synthesized and its photochemistry was examined. Irradiation of NBD‐S‐ONE in acetonitrile at λ > 300 nm selectively excited the keto chromophore. After intersystem crossing, the triplet energy of the keto group was transferred to the NBD group with 18.6% efficiency via a through‐bond mechanism, resulting in the isomerization of the latter group to the quadricyclane group.