Figure 6
Part of the crystal structure of (II), showing the formation of a chain of rings along [001] built from hard hydrogen bonds. For the sake of clarity, H atoms bonded to C atoms have been omitted. Atoms marked with an asterisk (*), a hash (#) or an ampersand (&) are at the symmetry positions ( − x, 1 − y, + z), ( − x, 1 − y, − + z) and (x, y, 1 + z), respectively. |