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Figure 1 . The coordinated mode of the metal ions. Ellipsoids are drawn at the 30% probability level. H atom have been omitted for clarity. [Symmetry codes: i −x + 1, y − ,-z + ; ii −x, −y + 1,-z + 1; iii −x + 1,-y + 1,-z + 1; iv x − 1,-y + ,z + 1/2]. |