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Quenching of triplet states by molecular oxygen and the role of charge-transfer interactions

✍ Scribed by A. Garner; F. Wilkinson

Publisher: Elsevier Science
Year: 1977
Tongue: English
Weight: 318 KB
Volume: 45
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(77)80057-2

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✦ Synopsis

The rate constants for oxygen quenching in benzene solution of the triplet states of several organic compounds with relatively high triplet energies have been measured in laser photolye> ar,.l pulse radiolysis experiments. The previously obscrvcd trend for aromatic hydrocarbons where the quenching rate cmstal!ts decrease from a limiting value of about one ninth of that expected for a &ffusion controlled reaction to lower v dues 'or triplet states with increasing triplet energy was nor obst-lvrd :G; *r: ?riplet states of certain aromatic ketones an 2 amL,es. The higher rate constants observed, e.g. oxygen quenching of triplet N-methyl indole has kQ = 1.4 X 10" dm3 mo,-' ?-I, a-e interpreted as being due to the presence of low lying triplet charge-transfer states which enhance the efficiency of yu-.,ming.

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