CIDEP STUDY OF RADICALS PRODUCED PHOTOCHEMICALLY IN THE ORGANIC SOLUTION OF 9-ACRIDONE AND PHENOLS

Citation
S. Niizuma et H. Kawata, CIDEP STUDY OF RADICALS PRODUCED PHOTOCHEMICALLY IN THE ORGANIC SOLUTION OF 9-ACRIDONE AND PHENOLS, Bulletin of the Chemical Society of Japan, 66(6), 1993, pp. 1627-1632
Citations number
11
Categorie Soggetti
Chemistry
ISSN journal
00092673
Volume
66
Issue
6
Year of publication
1993
Pages
1627 - 1632
Database
ISI
SICI code
0009-2673(1993)66:6<1627:CSORPP>2.0.ZU;2-I
Abstract
The photoreaction of the solution systems of 9-acridone (or N-methyl-9 -acridone) and phenols was investigated by optical spectroscopy, ESR, and time-resolved CIDEP techniques. CIDEP signals of acridone semiquin one and phenoxyl radicals were detected together and the hyperfine cou pling constants of acridone semiquinone were determined for the first time by simulation method. It was also clarified that radical pair mec hanism (RPM) with triplet precursor and triplet mechanism (TM) were th e main spin polarization mechanisms in these systems. The results indi cate that the excited triplet state of acridone abstracts a hydrogen o f phenols. Temperature, phenol concentration, light intensity and time dependence of the phenoxyl CIDEP signal intensity and/or pattern supp orted the conclusion.