Fluorescence quenching of Y-4,9-dihydro-4,6-dimethyl-9-oxo-1H-imidazo-1,2-a purine (Yt base) and the model compounds Yt(CH2)nadenine by α-bromonaphthalene

Ignacy Gryczynski, A. Kawski, S. Paszyc, B. Skalski

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The fluorescence quenching of Y-4,9-dihydro-4,6-dimethyl-9-oxo-1H-imidazo-1,2-a purine (Yt base) and of some model compounds Yt(CH2)nadenine (n = 2, 3, 5) by α-bromonaphthalene was studied in various solvents. The dependence of the ratio k/kd (where k is the rate constant for energy transfer from Yt to α-bromonaphthalene and kd is the diffusion rate constant) on the integrated overlap of the Yt fluorescence and the singlet-triplet absorption of α-bromonaphthalene was linear. The constant k for the model compounds varied with the length of the polymethylene chain and attained its lowest value for n = 3. This is probably due to an increased degree of base stacking interaction in the trimethylene-bridged compound.

Original languageEnglish
Pages (from-to)71-76
Number of pages6
JournalJournal of Photochemistry
Volume20
Issue number1
DOIs
StatePublished - 1 Jan 1982

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