Di­aqua­{2,2′-dimeth­oxy-6,6′-[(1E,1′E)-propane-1,3-diylbis(aza­nylyl­idene)bis­(methanylyl­idene)]diphenolato}nickel(II)

In the mol­ecule of the title compound, [Ni(C₁₉H₂₀N₂O₄)(H₂O)₂], the central Ni^II ion lies on a mirror plane and is surrounded by an N₂O₄ coordination set in the form of a distorted octa­hedron defined by the O atoms of two water mol­ecules and by two phenolic O and two imine N atoms of the tetra­dentate Schiff base ligand. In the crystal, O—H...O hydrogen bonds between the water mol­ecules and the phenolic and meth­oxy O atoms of neighbouring mol­ecules lead to the formation of rods propagating parallel to [100].

(Azido-κN){(E)-2-[1-(pyridin-2-yl)ethyl­idene­amino]­phenolato-κ³N,N′,O}copper(II)

In the title complex, [Cu(C₁₃H₁₁N₂O)(N₃)], the Cu^II cation is four-coordinated by an N₂O donor set of the tridentate Schiff base ligand and by the terminal N atom of the azide anion, forming a slightly distorted square-planar configuration.

{5,5′-Dihydroxy-2,2′-[(2-hydroxypropane-1,3-diyl)bis(nitrilomethanylyli­dene)]diphenolato}nickel(II) dihydrate

In the title complex, [Ni(C₁₇H₁₆N₂O₅)]·2H₂O, the Ni^II ion is four-coordinated by two azomethine N and two phenolato O atoms of the tetradentate Schiff base ligand in a slightly distorted square-planar geometry. In the six-membered ring containing the metal, the azomethine N atoms and the three C atoms of the connecting 1,3-di­amino­propane-2-ol, all atoms except the metal are disordered over two sets of sites with an occupacy ratio of 0.566 (3):0.434 (3). The central C atom of the major component is significantly out of the mean plane of the remaing atoms while the conformation of this ring in the minor component is noticeably different. In the crystal, O—H...O hydrogen bonds involving the lattice water mol­ecules and the hy­droxy groups are observed.