Figure 1
The extended asymmetric unit in I showing the coordination environment of the Ni atoms and the atom-labelling scheme (displacement ellipsoids are drawn at the 40% probability level). The atoms obtained by symmetry transformations are shown with 50% transparency. C-bound H atoms are omitted for clarity. Dashed lines represent hydrogen-bonding interactions. [Symmetry codes: (i) −x + , −y + , −z; (ii) −x + 1, y, −z + ]. |