Singlet−Singlet and Triplet−Triplet Energy Transfer in Bichromophoric Peptides

Autor:	L. Chen, W. N. Samaniego, W. G. Mcgimpsey, R. Carraway
Rok vydání:	1999
Předmět:	chemistry.chemical_compound chemistry Intramolecular force Benzophenone Moiety Flash photolysis Singlet state Physical and Theoretical Chemistry Chromophore Phosphorescence Photochemistry Fluorescence
Zdroj:	The Journal of Physical Chemistry A. 103:6082-6090
ISSN:	1520-5215 1089-5639
DOI:	10.1021/jp9901592
Popis:	Intramolecular singlet−singlet (SSET) and triplet−triplet (TTET) energy transfer processes were studied in solution in two bichromophoric peptides using absorption, fluorescence, phosphorescence, laser flash photolysis, and molecular modeling/dynamics. Compound I, a dipeptide formed by coupling 2-naphthyl-l-alanine and 4‘-benzoyl-l-phenylalanine (naphthalene and benzophenone chromophores), undergoes intramolecular SSET from the naphthyl chromophore to the benzophenone chromophore as indicated by singlet lifetime measurements as well as a reduction in the intensity of the steady-state fluorescence emission relative to 2-naphthyl-l-alanine itself. Results of the lifetime experiments coupled with modeling studies suggest that SSET is consistent with a Forster mechanism, although other mechanisms cannot be ruled out. Low-temperature phosphorescence and room-temperature laser flash photolysis results indicate that intramolecular TTET from the benzophenone group to the naphthyl moiety proceeds with a rate const...
Databáze:	OpenAIRE
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