Figure 2
The system of strong hydrogen bonds in structures (I) (X = Cl) and (II) (X = Br). The H⋯X⋯H angles are φ1 = 170°, φ2 = 84° and φ3 = 104° in (I), and φ1 = 73°, φ2 = 82° and φ3 = 105° in (II); s.u. values are ∼1°. The symmetry codes are as given in the tables. |