The search for novel manganese(II) compounds having interesting magnetic properties, using 1-(pyridin-2-yl)-2-(pyridin-2-ylmethylidene)hydrazine (HL) as a tridendate ligand, led to the preparation of the title mononuclear material, [MnCl(NO3)(C11H10N4)(H2O)], and the determination of its structure by XRD. The asymmetric unit comprises a discrete molecule in which the cation MnII is heptacoordinated. The environment around the cation is an almost perfect pentagonal 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 molecule. In the crystal, there are numerous hydrogen bonds of the types Ow—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 interlayer space. These axial ligands give rise to hydrogen bonds of the types Ow—H...ONO2, Ow—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.
Determination of the orientation of the axial ligands and of the magnetic properties of the haems in the tetrahaem ferricytochrome from Shewanella frigidimarina
