Figure 5
Part of the crystal structure of (2), showing chains formed by the hard hydrogen bonds linked into sheets by the soft hydrogen bonds. For the sake of clarity, H atoms not involved in the hydrogen bonding are omitted. The atoms marked with a star (*), hash (#), dollar sign ($) or ampersand (&) are at the symmetry positions (1 + x, y, −1 + z), (−1 + x, y, 1 + z), (1 − x, −y, − z) and (−x, 1 − y, 1 − z), respectively. |