Intramolecular Triplet Energy Transfer in Donor–Acceptor Molecules Linked by a Crown Ether Bridge

Autor:	Rui-Qin Zhang, Xiaohe Xu, Li-Ping Zhang, Bin Chen, Hai-Feng Ji, Kirk S. Schanze, Chen-Ho Tung, Xiao-Gang Fu, Li-Zhu Wu
Rok vydání:	2006
Předmět:	chemistry.chemical_classification Chemistry Norbornadiene Organic Chemistry General Chemistry Chromophore Photochemistry Acceptor Catalysis chemistry.chemical_compound Intramolecular force Benzophenone Flash photolysis Isomerization Crown ether
Zdroj:	Chemistry - A European Journal. 12:5238-5245
ISSN:	1521-3765 0947-6539
DOI:	10.1002/chem.200501151
Popis:	Bichromophoric compounds BP-C-NP and BP-C-NBD were synthe- sized with benzophenone chromophore (BP) as the donor, and 2-naphthyl (NP) and norbornadiene group (NBD) as the acceptor, respectively. Their in- tramolecular triplet energy transfer was examined. The bridges linking the donor and acceptors in these molecules involve a crown ether moiety complex- ing a sodium ion. Phosphorescence quenching, flash photolysis and photo- sensitized isomerization experiments indicate that intramolecular triplet energy transfer occurs with rate con- stants of about 3.3 = 10 5 and 4.8 = 10 5 s � 1 and efficiencies of about 33 and 42 % for BP-C-NP and BP-C-NBD, respec- tively. Theoretical calculations indicate that these molecules adopt conforma- tions below room temperature which allow their two-end chromophores con- ducive to through-space energy trans- fer.
Databáze:	OpenAIRE
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