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Figure 1 . The asymmetric unit of (I), showing the atom-numbering scheme. H atoms are not included and displacement ellipsoids are drawn at the 30% probability level. Additional symmetry related atoms are included to complete the coordination geomtry around the La atoms [Symmetry codes: (A) 1.5 — x, —0.5 + y, 0.5 — z; (B) 0.5 + x, 0.5 — y, —0.5 + z; (C) 1.5 — x, 0.5 + y, 0.5 — z; (D) 1 — x, — y, 1 — z]. |