Bis(di-2-pyridylmethane-diol-κN,O,N')nickel(II) dinitrate.

The title compound, [Ni(C(11)H(10)N(2)O(2))(2)](NO(3))(2), consists of an Ni(II) atom coordinated by two tridentate chelating di-2-pyridylmethane-diol [(2-py)(2)C(OH)(2)] ligands. The Ni(II) atom is located on an inversion center. The geometry around the Ni(II) atom is distorted octa-hedral. The gem-diol (2-py)(2)C(OH)(2) ligand adopts the coordination mode η(1):η(1):η(1). The Ni-N and Ni-O bond lengths are typical for high-spin Ni(II) in an octa-hedral environment [Ni-N = 2.094 (2) and 2.124 (3) Å, and Ni-O = 2.108 (3) Å]. One of the hydr-oxy H atoms is split over two positions which both inter-act with the nitrate anion. The occurence of different O-H⋯O hydrogen bonds leads to the formation of a layer parallel to the (101) plane.