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The asymmetric unit of the title compound, trans -di-aqua-(1,4,8,11-tetra-aza-undecane-κ 4  N  1 , N  4 , N  8 , N  11 )nickel(II) bis-(pyridine-2,6-di-carboxyl-ato-κ 3  O  2 , N , O  6 )nickel(II) {[Ni( L )(H 2 O) 2 ][Ni(pdc) 2 ] where L = 1,4,8,11-tetra-aza-undecane (C 7 H 20 N 4 ) and pdc = the dianion of pyridine-2,6-di-carb-oxy-lic acid (C 7 H 3 NO 4  2- )} consists of an [Ni( L )(H 2 O) 2 ] 2+ complex cation and a [Ni(pdc) 2 ] 2- anion. The metal ion in the cation is coordinated by the four N atoms of the tetra-amine ligand and the mutually trans O atoms of the water mol-ecules in a tetra-gonally elongated octa-hedral geometry with the average equatorial Ni-N bond length slightly shorter than the average axial Ni-O bond [2.087 (4) versus 2.128 (4) Å]. The ligand L adopts its energetically favored conformation with five-membered and six-membered chelate rings in gauche and chair conformations, respectively. In the complex anion, the Ni II ion is coordinated by the two tridentate pdc 2- ligands via their carboxyl-ate and nitro-gen atom donors in a distorted octa-hedral trans -NiO 4 N 2 geometry with nearly orthogonal orientation of the planes defining the carboxyl-ate rings and the average Ni-N bond length [1.965 (4) Å] shorter than the average Ni-O bond distance [2.113 (7) Å]. In the crystal, the NH donor groups of the tetra-amine, the carb-oxy-lic groups of the pdc 2- anion and the coordinated water mol-ecules are involved in numerous N-H⋯O and O-H⋯O hydrogen bonds, leading to electroneutral sheets oriented parallel to the (001) plane.

Crystal structure of trans-diaqua(1,4,8,11-tetraazaundecane)nickel(II) bis(pyridine-2,6-dicarboxylato)nickel(II)