Bis­(di-2-pyridyl­methanediol-κ³N,O,N′)­nickel(II) dilactate

Di-2-pyridyl ketone reacts with nickel(II) dilactate in water to form the title compound, [Ni(C₁₁H₁₀N₂O₂)₂](C₃H₅O₃)₂, whose Ni atom is N,O,N′-chelated by the ketals in an octahedral environment. The cation interacts with the two anions through extensive hydrogen bonds to furnish a helical chain motif that runs along the b axis.

A C-centered monoclinic modification of bis­(di-2-pyridyl­methanediol-κ³N,O,N′)copper(II) di­acetate tetrahydrate

Di-2-pyridyl ketone undergoes hydro­lysis when reacted with copper(II) acetate to form the title compound, [Cu(C₁₁H₁₀N₂O₂)₂](C₂H₃O₂)₂·4H₂O. The crystal structure consists of octahedral cations that are linked to the anions and to the uncoordinated water molecules, giving rise to a three-dimensional network structure. This C-centered monoclinic modification is less compact than the primitive monoclinic modification reported by Reinoso et al. [(2003). Acta Cryst. E59, m548–m550]. The Cu atom is located at a center of inversion.