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Properties of the Triplet State of N,N,Nî,Nî‐Tetraethyloxonine
Author(s) -
Kamat Prashant V.,
Lichtin Norman N.
Publication year - 1982
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198200022
Subject(s) - chemistry , quenching (fluorescence) , flash photolysis , photochemistry , electron transfer , triplet state , analytical chemistry (journal) , fluorescence , kinetics , molecule , reaction rate constant , organic chemistry , physics , quantum mechanics
The triplet state of N,N,Nî,Nî‐tetraethyloxonine, TEO + generated by means of sensitization with 9,10‐dibromoanthracene, was investigated in ethanol solution by laser flash photolysis‐kinetic spectrometry employing the first harmonic of a Q‐switched ruby laser at 347.2 nm. Quenching of both the protonated triplet, TEOH 2+ (T 1 ), τ = 47 μs, and the unprotonated triplet, TEO + (T 1 ), τ = 285 μs, by TEO + (S 0 ) proceeds with substantial net electron transfer. No net electron transfer is detectable in the quenching of TEOH 2+ (T 1 ), and TEO + (T 1 ) by O 2 or 1,3,5,7‐cyclooctatetraene, processes which apparently involve transfer of energy. Specific rates of quenching are reported and the implications of the quenching processes for stability of TEO + in devices for conversion or storage of solar energy are discussed.