INTRAMOLECULAR INTERACTIONS IN AROMATIC AMINO ACID MODEL COMPOUNDS
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Publisher:Ohio State University
Substituents can affect the optical properties of the aromatic group even when the substituent and the ring are separated by one or more methylene groups. The mechanisms underlying these intramolecular interactions have been investigated. Changes in the intersystem crossing rate constant and hence in the phosphorescence-fluorescence ratios due to the substituent are interpreted in terms of a charge-transfer mechanism. Such a mechanism is similar to that proposed for singlet-triplet absorption enhancement by oxygen. The optical properties of aromatic amino acids where the substituent is a peptide bond, a carbosyl, or an amino group are explained in the same manner.
Author Institution: Biophysics Deparrment, Michigan State Univeristy