Figure 10
Projections along [010] of the cyclic dimers in (a) compound (IVa) and (b) compound (IVb). Hydrogen bonds are drawn as dashed lines and, for the sake of clarity, H atoms not involved in the motifs shown have been omitted. The atoms marked with an asterisk (*) are at the symmetry position (−x, −y + 1, −z + 1). Note the different locations of the origin and the different orientations of the axes. |