Figure 7
Orientational disorder and potential crystal-packing arrangements: (a) two distinct orientations (P-to-I versus I-to-P) of the UA molecule in the UAD unit cell with the chemical occupancy 0.688:0.312; (b) molecular packing of UAD (Parkin & Hope, 1998) and UAA (Ringertz, 1966); (c) molecular packing of potential disordered packing arrangements of UAD. Carbon, nitrogen, oxygen and hydrogen atoms are marked in gray, blue, red and white, respectively. |