Figure 1
The structure of the two ionic components, showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. The anion is disordered across a centre of inversion and the atoms marked `a′ or `b′ are at the symmetry positions (1 − x, 1 − y, 1 − z) and (1 − x, 2 − y, −z), respectively. |