Abstract
The search for novel manganese(II) compounds having inter-esting magnetic properties, using 1-(pyridin-2-yl)-2-(pyridin-2-yl-methyl-idene)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 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 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 inter-layer 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.
Highlights
The search for novel manganese(II) compounds having interesting magnetic properties, using 1-(pyridin-2-ylmethylidene)-2-(pyridin-2-yl)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
There are numerous hydrogen bonds of the types Ow—HÁ Á ÁONO2 and C—HÁ Á ÁONO2, which generate layers parallel to the bc plane in which the ligands in the axial positions point into the interlayer space
Summary
The coordination chemistry of manganese remains very interesting as this metal can have several degrees of oxidation and its complexes can display different coordination numbers and geometries that are not always predicted (Chiswell et al, 1987; Baldeau et al, 2004; Mikuriya et al, 1997). The involvement of manganese in various important biological processes such as oxidation of water by photosynthetic enzymes (Whittaker & Whittaker, 1997), hydrogen peroxide disproportionation by catalase (Meier et al, 1996), superoxide dismutase (SOD) (Schwartz et al, 2000), ribonucleotide reductase and lipoxygenase (Baffert et al, 2003) increases the interest of scientists in this metal. These examples from nature inspire chemists to search for biomimetic catalysts of these metalloenzymes that are highly selective and cause little damage to the environment. C1—H1Á Á ÁO2 and C11—H11Á Á ÁO3, are observed in the structure (Table 2, Fig. 1)
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