title: Fast processes and intermediates in photochemistry of 7-dimethyl-germanorbornadiene.
abstract: Laser pulse photolysis experiments have shown that the triplet excited-state of 1,2,3,4-tetraphenylnaphthalene (TPN) is one of the primary intermediates of the photochemical transformation of 7,7'-dimethylgerma-1,4,5,6-tetraphenyl-2,3-benzo-norbornadiene (GNB) in hexane solution. The molar absorption of T-T absorption and the quantum yield of the intersystem crossing of TPN were determined from the triplet-triplet energy transfer. The scheme of GNB photocleavage has been suggested where the triplet excited TPN originated from the triplet state of biradical through cleavage of the second C-Ge bond, the latter being generated from the excited singlet state of the initial GNB after the cleavage of the first C-Ge bond and the intersystem crossing. Other channels of GNB's chemical transformation have been discussed.
authors.affiliation: Institute of Chemical Kinetics and Combustion SB RAS, 630090, Novosibirsk, Russia.
authors.forename: Margarita V
authors.initials: MV
authors.lastname: Kaletina
authors.forename: Victor F
authors.initials: VF
authors.lastname: Plyusnin
authors.forename: Vyacheslav P
authors.initials: VP
authors.lastname: Grivin
authors.forename: Valeriy V
authors.initials: VV
authors.lastname: Korolev
authors.forename: Tatyana V
authors.initials: TV
authors.lastname: Leshina