Figure 3
(a) Molecular packing in the (10) plane. Dashed lines indicate O—H⋯O hydrogen bonds; C4—H4⋯O1(−x + , y + , −z + ) contacts are indicated by thin dotted lines. Similar arrangements are present in the crystal structures of 3,5-Br and 3,5-Cl (supramolecular construct S2). (b) Three corrugated sheets stacked in the a-axis direction. |