Bis[2-(1-imino­eth­yl)phenolato-κ²N,O]nickel(II)

There are one and a half independent mol­ecules in the asymmetric unit of the title compound, [Ni(C₈H₈NO)₂], one of which is situated on an inversion center. In both mol­ecules, the Ni^II ion is coordinated by two O and two N atoms from two Schiff base ligands in an approximate square-planar geometry. Inter­molecular N—H...O hydrogen bonds link three mol­ecules into centrosymmetric trimer. The crystal packing exhibits weak inter­molecular C—H...O hydrogen bonds and voids of 37 ų.

Chloridobis(dimethyl­glyoximato-κ²N,N′)(ethyl pyridine-3-carboxyl­ate-κN)cobalt(III)

In the title compound, [Co(C₄H₇N₂O₂)₂Cl(C₈H₉NO₂)], which was prepared as a model complex of vitamin B₁₂, the Co^III atom, which is linked to four N atoms of the pseudo-macrocyclic (dmgH)₂ ligand (dmgH is dimethyl­glyoximate) in the equatorial plane and one Cl⁻ anion and one N atom of ethyl nicotinate in apical positions, displays an approximately octa­hedral coordination. The Co atom is 0.0187 (8) Å out of the mean plane of the four equatorial N atoms. The structure has an O...H...O bridge, which is very common in cobaloxime derivatives, with O...H distances of 1.24 (2) and 1.25 (2) Å.