Figure 21
Part of the crystal structure of (3) showing the formation of a hydrogen-bonded molecular ladder along [001]. For the sake of clarity, the water molecules, the H atoms bonded to C atoms and the unit-cell box are all omitted. The O and N atoms marked with an asterisk (*), a hash (#) or a dollar sign ($) are at the symmetry positions (2 - x, y, 1 - z), (x, y, 1 + z) and (x, y, -1 + z), respectively, and the Ca1& atom is at the position (1, 1 + y, ½. |