| Summary: | In the title complex, [Ni(C20H22N2O4)]·0.5H2O, the NiII ion is in a slightly distorted square-planar geometry involving an N2O2 atom set of the tetradentate Schiff base ligand. The asymmetric unit contains one molecule of the complex and half a water solvent molecule. The solvent water molecule lies on a crystallographic twofold rotation axis. An intermolecular O—H...O hydrogen bond forms an R21(4) ring motif involving a bifurcated hydrogen bond to the phenolate O atoms of the complex. In the crystal structure, molecules are linked by π–π stacking interactions, with centroid–centroid distances in the range 3.5310 (11)–3.7905 (12) Å, forming extended chains along the b axis. In addition, there are Ni...Ni and Ni...N interactions [3.4404 (4)–4.1588 (4) and 3.383 (2)–3.756 (2) Å, respectively] which are shorter than the sum of the van der Waals radii of the relevant atoms. Further stabilization of the crystal structure is attained by weak intermolecular C—H...O and C—H...π interactions.
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