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- W2057340383 abstract "Abstract The photochemical behaviour of trans isomers of the four α,α′-di-X-stilbenes (XF, Cl, Br or I in the olefinic positions) was studied in solution at room temperature. The main photoreaction of F2- or Cl2-stilbene is trans → cis isomerization, whereas diphenylacetylene (DPA) and X2 are the photoproducts of Br2- and I2-stilbene. The quantum yields of Br2 and I2 elimination are typically 0.2 and 0.6 respectively and are essentially independent of the kind of solvent and the irradiation wavelength (222, 254 or 313 nm). The same transient (λmax ≈ 410 nm), observed by laser flash photolysis (λexc = 248 nm) of either Br2- or I2-stilbene, is assigned to the lowest triplet state of DPA which is formed by consecutive absorption of two photons; the first step generates DPA via the excited singlet state of trans-X2-stilbene by homolytic cleavage of the two CX bonds and subsequent excitation of DPA within the 20 ns laser pulse yields 3DPA∗ via intersystem crossing." @default.
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- W2057340383 date "1995-08-01" @default.
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- W2057340383 title "Photolysis of trans-α,α′-dihalostilbenes" @default.
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- W2057340383 doi "https://doi.org/10.1016/1010-6030(95)04066-o" @default.
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