Figure 3
Part of the crystal structure of (II) showing the coordination at calcium. Atoms marked with an asterisk (*), hash (#) or dollar sign ($) are at the symmetry positions (1 − x, y, ½ − z), (x, 1 + y, z), and (1 − x, 1 + y, ½ − z), respectively. Only one set of positions for O1, O2 and O3 is shown (see text). |