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Figure 1 Molecular unit of (I) showing the coordination geometry of zinc. Displacement ellipsoids drawn at a 50% probability level. The independent part of the molecule drawn with heavy bonds; the (overlapping) symmetry related one, with light bonds. Only H atoms invovled in H-bonding (in dashed lines) have been included·[Symmery code (i): 1 –x, y,1/2 – z] . |