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- W2094207918 abstract "In continuation of our studies on crystal engineering using fluorine as a steering group, the photobehaviour of di and tri fluoro 4-styrylcoumarins has been examined. It is found that out of the five derivatives, four crystallize into β-packing mode producing syn-HH photodimer upon irradiation whereas the parent hydrocarbon produces an anti H-T dimer. The packing features of the photolabile crystals of 4-(4-fluorostyryl)-6-fluorocoumarin (1), 4-(2,6-difluorostyryl)-6-fluorocoumarin (2) and the photodimer (3a) of 4-(2,6-fluorostyryl)-7-fluorocoumarin (3) have been determined by single crystal X-ray diffraction studies. The stereochemistry of the photodimer of 4-(2-fluorostyryl)-6-fluorocoumarin (4) is deduced based on preliminary X-ray crystallographic data. However, 4-(2,6-difluorostyryl) coumarin (5) is photoinert. The remarkable steering ability of fluorine is established with the molecular packing in the crystal lattice leading to the formation of syn H-H dimer in the above four examples." @default.
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- W2094207918 date "1999-03-01" @default.
- W2094207918 modified "2023-10-16" @default.
- W2094207918 title "Studies in crystal engineering: Steering ability of fluorine in 4-styrylcoumarins" @default.
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- W2094207918 doi "https://doi.org/10.1016/s0040-4020(99)00103-9" @default.
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