Journal article

TEMPERATURE-DEPENDENCE OF TRYPTOPHAN AND TYROSINE LUMINESCENCE IN POLYVINYL-ALCOHOL) FILMS

R SAKUROVS, KP GHIGGINO

AUSTRALIAN JOURNAL OF CHEMISTRY | C S I R O PUBLICATIONS | Published : 1981

Abstract

The temperature dependence of the fluorescence and phosphorescence from tyrosine and tryptophan in poly(vinyl alcohol) films has been studied over the temperature range 90-295 K. A kinetic scheme is proposed which allows the calculation of activation energies for excited singlet and triplet state deactivation processes. A single temperature-dependent radiationless process from the singlet state is observed for tyrosine and tryptophan, with activation energies of 5·2 ± 0·4 and 7·1 ± 0·6 kJ mol-1 respectively. However, two distinct temperature transitions have been detected for triplet- state relaxation at 180 and 255 K. The role of polymer phase transitions in determining excited state relaxa..

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University of Melbourne Researchers