In continuation of our studies on the influence of fluoro
substitution on the solid state photobehaviour and packing
pattern of styrylcoumarins, the results obtained for
4-(3-fluorostyryl)coumarin 1, 4-styryl-6-fluorocoumarin 2 and
4-styryl-7-fluorocoumarin 3 are presented. The configuration of
the dimers was established on the basis of crystal packing of 1
and 2 (α-packed). A rationale for the significantly lower
dimer yield in the crystal for 2 is proposed. In the observed
centrosymmetric arrangement of the reactants the
C![[double bond, length as m-dash]](http://www.rsc.org/images/entities/char_e001.gif)
O · · · π (phenyl)
contacts seem to provide additional attractive
interactions.
C–H · · · O and
C–H · · · F
hydrogen bonding seems to provide stability in these
structures.
O · · · π (phenyl)
contacts seem to provide additional attractive
interactions.
C–H · · · O and
C–H · · · F
hydrogen bonding seems to provide stability in these
structures.
Journal of the Chemical Society, Perkin Transactions 2
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