ChemInform Abstract: Exciplex Formation in Complexes Between Cyclophane Hosts and Aromatic Guests: Evidence That the Ground-State Complexes Exist in More than One Distinct Geometry.
✍ Scribed by David R. Benson; Jiaying Fu; Carey K. Johnson; Steven W. Pauls; David A. Williamson
- Publisher
- John Wiley and Sons
- Year
- 2010
- Weight
- 32 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0931-7597
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✦ Synopsis
Exciplex Formation in Complexes Between Cyclophane Hosts and Aromatic Guests: Evidence That the Ground-State Complexes Exist in More than One Distinct Geometry.
-Several naphthalene derivatives and fluorene form exciplexes with cyclophanes (I) when the host-guest complexes are photoexcited. Bulky substituents on both host and guest reduce exciplex stability, suggesting the importance of close contact between donor and acceptor π-systems in stabilizing these exciplexes. Differences in preexponential factors for exciplex formation and decay determined from time-resolved fluorescence experiments reveal that there is more than one pathway to exciplex formation. The data indicate that the ground-state host-guest complexes exist in at least two distinct geometries. -(BENSON,