Premium
MESODIPHENYLHELIANTHRENE—THE MOST REACTIVE SINGLET OXYGEN ACCEPTOR
Author(s) -
Acs A.,
Schmidt R.,
Brauer H.D.
Publication year - 1983
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.1751-1097.1983.tb03377.x
Subject(s) - singlet oxygen , quantum yield , quenching (fluorescence) , photochemistry , chemistry , reaction rate constant , acceptor , singlet state , yield (engineering) , oxygen , reactive intermediate , fluorescence , excited state , kinetics , organic chemistry , catalysis , physics , thermodynamics , atomic physics , optics , quantum mechanics , condensed matter physics
— The self‐sensitized photooxidation of mesodiphenylhelianthrene in various solvents has been investigated. The involvement of 1 O 2 as the reactive intermediate in the formation of the endoperoxide has been demonstrated by the quenching of the photooxidation by the efficient 1 O 2 ‐quencher β‐carotene. The rate constant for the addition of 1 O 2 to mesodiphenylhelianthrene has been determined to be k R ≅ 10 10 M ‐1 s ‐1 , which is the highest value hitherto known in the literature. The probability factor p , which describes the concentration independent part of the overall quantum yield, has been measured to be p =0.17.