Figure 2
The crystal structure of (I), showing (a) the hexagonal layer parallel to the (10) plane (H atoms have been omitted for clarity) and (b) a fragment of the spatial arrangement of the centres of gravity of molecules of (I), illustrating the three-layered fcc packing motif. Upper, medium and lower levels are shown as dark-, medium- and light-grey balls, respectively. Solid and dashed lines show the intra- (hydrogen bonding) and interlayer (van der Waals) distances between the molecular centres. |