Abstract
Steady state and transient fluorescence techniques were applied to study the intermolecular excimer formation of N-acetyl-2-pyrenylalanine ethyl ester. The results are compared with those obtained previously for the intermolecular excimer of N-acetyl-1-pyrenylalanine methyl ester. The tendency to form the excimer is not affected by the localization of the alanine chain on the pyrene chromophore, but the dissociation of the 2-pyrenylalanine excimer requires a smaller activation energy than that of the 1-pyrenylalanine excimer in acetonitrile. This is not due to a difference in the pyrene—pyrene interaction since both excimers possess similar fluorescence properties. Contrary to the 1-pyrenylalanine excimer, there is no evidence of an interalanine interaction in the excimer of 2-pyrenylalanine. These results may indicate that a perfect sandwich ( D 2h ) structure is not formed in the excimers of pyrenylalanines. The geometry of the intermolecular excimers of pyrenylalanines was investigated and the results are compared with theoretical calculations for the pyrene excimer.
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