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Figure 1 . The coordination mode and linkage of the metal ions and ligands in (I). Ellipsoids are drawn at the 30% probability level. H atoms have been omitted for clarity. [Symmetry codes: (A) −x + 2, −y, −z; (B) −x + 1, −y, −z − 1; (C) −x + 1, −y, −z; (D) x − 1, y, z]. |