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Figure 2 A view of the crystal packing in the structure of (I), in proximity of the ab face. Hydrogen bonds are denoted by dashed lines. Only hydrogen atoms involved in the formation of hydrogen bonds are shown. Chains of hydrogen–bonded molecules, parallel to the [110] direction, are formed by centrosymmetric dimers of the two types of symmetry–independent molecules (denoted by the A and B letters, respectively). The solvent molecules, not shown in this drawing, lie between this layer and the parallel one at c = 1/2, where the chains of hydrogen–bonded molecules exhibit the alternative [1–10] orientation. |