Figure 1
The molecular structure of (I), showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level and H atoms are shown as small spheres of arbitrary radii. Unlabelled atoms are related to labelled atoms by symmetry operation (i) for NA and (ii) for DPA. Dashed lines indicate the bifurcated hydrogen bond. [Symmetry codes: (i) 1 − x, 1 − y, 2 − z; (ii) 1 − x, y, − z.] |