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Figure 2 Coordination polyhedra of the different Pb cations. Displacement ellipsoids are drawn at the 50% probability level. The labeling scheme for symmetry-related atoms is the following: (i) 0.5-x,0.5 + y,1.5-z˛ (ii) x,1 + y,z˛ (iii) −x,-y,1-z˛ (iv) 0.5-x,-0.5 + y,1.5-z˛ (v) x,-1-y,0.5 + z˛ (vi) x,-y,0.5 + z. |