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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(NO 3 )(C 11 H 10 N 4 )(H 2 O)], and the determination of its structure by XRD. The asymmetric unit comprises a discrete mol-ecule in which the cation Mn II 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⋯ONO 2 and C-H⋯ONO 2 , 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⋯ONO 2 , 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.

acta crystallographica. section e, crystallographic communications

Crystal structure of aquachlorido(nitrato-κ2 O,O′)[1-(pyridin-2-yl-κN)-2-(pyridin-2-ylmethylidene-κN)hydrazine-κN 2]manganase(II)