Packing arrangements chlorocoumarins

Figure 26. Packing arrangement of 7-chlorocoumarin in the crystalline state. Note the presence of two pairs of reactive 7-chlorocoumarin. In one pair the molecules are related by a centrosymmetry and in the other by a mirror symmetry. On this diagram mirror symmetric molecules appear one on top of another. Centrosymmetric molecules appear to be displaced with respect to the other.

Figure 2. Packing Arrangement of (a) 7-Chlorocoumarin and (b) 4-Methyl 7-chlorocoumarin.

Figure 15 Packing arrangement of 7-chlorocoumarin molecules in crystals. Note that in principle dimerization can occur between centrosymmetric or mirror symmetric pairs of molecules. Both are within the stipulated topochemical distance.

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