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EXTERNAL HEAVY ATOM EFFECT IN THE ENERGY TRANSFER FROM TETRAMETHYL‐1,2‐DIOXETANE CHEMI‐EXCITED ACETONE TO ANTHRACENE
Author(s) -
Adam Waldemar,
Cilento Giuseppe,
Zinner Klaus
Publication year - 1980
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1980.tb03990.x
Subject(s) - intersystem crossing , anthracene , photochemistry , excited state , chemistry , acceptor , bromobenzene , triplet state , fluorescence , singlet state , atomic physics , physics , organic chemistry , quantum mechanics , condensed matter physics , catalysis
Abstract— Generation of the fluorescent state of anthracene by energy transfer from chemi‐excited acetone is remarkably more efficient in bromobenzene than in benzene. Triplet‐triplet energy transfer populates the second triplet of the acceptor and is followed by intersystem crossing (ISC) to the fluorescent state. It is only on the latter ISC step that the external heavy atom perturbation operates. However, with 9,10‐dibromoanthracene as acceptor, spin‐orbital coupling also increases the transfer step and more in bromobenzene than in benzene. A possible inference from this work is that 9,10‐diphenyl‐anthracene, which is commonly used to count singlets, may to some extent also count triplets.