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MECHANISM OF THE PHOTOCHEMICAL REACTION OF DIPHENYLAMINES WITH CARBON TETRACHLORIDE
Author(s) -
Wyrzykowska K.,
Grodowski M.,
Weiss K.,
Latowski T.
Publication year - 1978
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.1751-1097.1978.tb07712.x
Subject(s) - chemistry , photochemistry , diphenylamine , carbon tetrachloride , triphenylamine , radical ion , photodissociation , ultrafast laser spectroscopy , polar , absorption (acoustics) , ion , spectroscopy , organic chemistry , physics , quantum mechanics , astronomy , acoustics
. The quantum yields of HCI (φ HC1 ) formation have been measured for the photolysis of N ‐methyldiphenylamine (MeDPA), triphenylamine (TPA) and diphenylamine (DPA) in the presence of CCl 4 in polar solvents. The quantum yields of N‐methylcarbazole formation (φ mφca ) have also been determined for the system MeDPA‐CCl 4 . With increasing CCl 4 concentration, φ HCl increases as φ MeCA decreases, and φ HCl reaches maximum values 2.7 at 1 M CCl 4 . Using laser photolysis, transient spectra have been recorded for MeDPA in the absence and presence of CCl 4 in polar and non‐polar solvents, and for TPA. Transient absorption due to the triplet states and photocyclization products (without CCU), exciplexes, the (C 6 H 5 ) 2 NCHi radical, the MeDPA + cation radical, the (TPA + ., CCl 4 ) ion pair, and the TPA + cation radical have been identified. The mechanistic implications of these results are discussed.