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Figure 4
(a) 2-Phenylbenzimidazole molecule with indication of the intramolecular contacts and torsion angle φ. (b) Modulation plot of the torsion angle φ between the two planar moieties as indicated in (a) for molecule A (green) with an amplitude of ±5° and molecule B (blue) with an amplitude of ±3°. The grey line indicates the value φ = 180° corresponding to a flat molecule. Figure taken from Schönleber (2011BB125). Varying t for a certain geometric parameter, like a rotation angle, from t = 0 to t = 1, gives all values for this parameter occurring anywhere in the three-dimensional aperiodic crystal structure along the physical space R3 (Janssen et al., 2006BB74).

IUCrJ
Volume 2| Part 1| January 2015| Pages 137-154
ISSN: 2052-2525
doi:10.1107/S2052252514023550