Acta Cryst. (2009). E65, m570-m571  [ doi:10.1107/S1600536809014500 ]

{6,6'-Dimethoxy-2,2'-[2,2-dimethylpropane-1,3-diylbis(nitrilomethylidyne)]diphenolato}nickel(II) 1.78-hydrate

C. S. Yeap, R. Kia, H. Kargar and H.-K. Fun

Abstract: In the title complex, [Ni(C₂₁H₂₄N₂O₄)]·1.78H₂O, the Ni^II ion has a slightly distorted planar geometry, coordinated by the two N and two O atoms of the tetradentate Schiff base ligand, with a mean deviation of 0.272 Å from the NiN₂O₂ plane. The N and O donor atoms are mutually cis. The dihedral angle between two benzene rings of the ligand is 38.86 (8)°. There are also three solvent water molecules, two of which lie across different crystallographic twofold rotation axes; one of these is partially occupied with a refined occupancy factor of 0.570 (7). The water molecules are linked together as tetramers in R₂²(8) ring motifs, which also connect two neighbouring molecules of the complex through a network of O-HO hydrogen bonds. The crystal structure is further stabilized by intermolecular C-HO and C-H interactions, which link neighbouring molecules into extended chains along the b axis. Other interesting features of the crystal structure are the short intermolecular CC [3.204 (3)-3.365 (3) Å] and the CO [3.199 (2)-3.205 (2) Å] contacts which are shorter than the sum of the van der Waals radii of these atoms.

Online 25 April 2009

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