Browsing by Author "Donckt, E. Vander"

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    Electron Transfer from Aromatic Molecules to Dimethylmercury via a Triplet Exciplex
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (04), 1978) Donckt, E. Vander; Vooren, C. Van
    Whereas low concentrations of added dimcthylmcrcury [0 < (DMM) < 0.1-1 mol dm-3] increase the intersystem crossing rates of electronically excited aromatic molecules, higher concentrations of the fluorescence quencher favour electron transfer from the excited aromatic to the dimethylmercury. A kinetic scheme is proposed, based on fluorescence intensity measurements, on optical densities of triplet species and radical cations as observed by flash photolysis. The data are consistent with the formation of a trimolecular complex consisting of an electronically excited aromatic species and two molecules of dimethylmercury.
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    Photochemistry of Aromatic Compounds: Part 5.—Measurement of Quantum Yields of Triplet State Formation by Flash Photolysis
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (1), 1972) Donckt, E. Vander; Lietaer, D.
    The quantum yields of triplet-state formation of 1,2-benzanthracene, 1,2,5,6-dibenzanthracene, tetracene and 2-naphthylamine have been measured using the effect of organometallic compounds as dimethylmercury, tetramethyllead and tetramethyltin on fluorescence intensities and optical densities of triplet to triplet absorption. The quantum yields of triplet state formation of aromatic hydrocarbons can be obtained from the results of flash photolysis experiments only, although the method which involves relative fluorescence measurements is usually preferable especially for viscous solvents or relatively weak heavy atom quenchers.