Crystal structure of aqua-chlorido-(nitrato-κ 2 O , O ')[1-(pyridin-2-yl-κ N )-2-(pyridin-2-yl-methyl-idene-κ N )hydrazine-κ N 2 ]manganase(II).

The search for novel manganese(II) compounds having inter-esting magnetic properties, using 1-(pyridin-2-yl)-2-(pyridin-2-yl-methyl-idene)hydrazine (H L ) as a tridendate ligand, led to the preparation of the title mononuclear material, [MnCl(NO3 )(C11 H10 N4 )(H2 O)], and the determination of its structure by XRD. The asymmetric unit comprises a discrete mol-ecule in which the cation MnII is hepta-coordinated. The environment around the cation is an almost perfect penta-gonal bipyramid. The base is defined by the two N atoms of the pyridine rings, the N atom of the imino function of the ligand and the two O atoms of the chelating bidentate nitrate ligand. The apical positions are occupied by a Cl atom and a water mol-ecule. In the crystal, there are numerous hydrogen bonds of the types O w -H⋯ONO2 and C-H⋯ONO2 , which generate layers parallel to the bc plane in which the ligands in the axial positions point into the inter-layer space. These axial ligands give rise to hydrogen bonds of the types O w -H⋯ONO2 , O w -H⋯Cl, N-H⋯Cl and C-H⋯Cl, leading to a three-dimensional framework. The chain bridging the two pyridine rings is disordered over two sets of sites in a 0.53 (2):0.47 (2) ratio.