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. |