A new polymorphic form of bis­(acet­ato-κO)bis­[2-(pyridin-2-yl)ethanol-κ²N,O]nickel(II)

A new polymorph of a mononuclear nickel(II) acetate com­plex with 2-(pyridin-2-yl)ethanol ligands, [Ni(CH₃COO)₂(C₇H₉NO)₂], has been prepared and structurally characterized. Its mol­ecular structure resembles the structures of two previously reported polymorphs in that the Ni^II atom is located on an inversion centre and is coordinated by pairs of acetate and 2-(pyridin-2-yl)ethanol ligands. The acetate anions are coordinated in a monodentate manner, while the 2-(pyridin-2-yl)ethanol ligands are coordinated in a bidentate chelating mode involving the endocyclic N atom and the hy­droxy O atom of the ligand side chain. A strong bifurcated intra­molecular hydrogen-bond inter­action was observed involving the hy­droxy O atom as donor and both acetate O atoms as acceptors. No classical inter­molecular hydrogen-bond contacts were observed. However, the crystal packing is effected through π–π and C—H...π inter­actions, giving rise to a different packing arrangement. A brief comparison of the three polymorphic forms is presented.