Heterocycles p. 1039 - 1058 (2013)
Update date:2022-08-17
Topics:
Ishikawa, Tomoe
Sonobe, Miho
Hayakawa, Akinori
Igarashi, Tetsutaro
Sakurai, Tadamitsu
This study sought to support the development of enantioselective dipeptide fluorescence sensors by examining the ability of the N-acyl-(S)-1- naphthylalanyl-(S)-phenylglycine and N-acyl-(S)-1-naphthylalanyl-(S)-1- naphthylalanine dipeptides (bridged by the 1,2-phenylene or ethylene spacer chain) to discriminate between aliphatic amine-derived (S)- and (R)-enantiomers. The results indicated that both hydrogen-bonding interactions in the ground state and charge-transfer interactions in the excited state are involved in the fluorescence quenching of these bridged dipeptides by chiral amines to produce the upward curving Stern-Volmer plots. In addition, the numerical analysis of these plots led to the conclusion that the bridged naphthylalanylphenylglycine dipeptide shows the highest ability to differentiate the (S)-enantiomer from (R)-enantiomer when the emission of this dipeptide is quenched by chiral alaninols.
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