Bis[(2-pyridyl)(2-pyridylamino)methanolato]manganese(III) nitrate

The MnIII atom in the title complex, [Mn(C11H10N3O)2]NO3, is coordinated by the two tridentate (2-pyridyl)(2-pyridylamino)methanolate ligands, forming a six-coordinate environment. The four pyridyl N atoms constitute the equatorial plane on which the manganese(III) ion lies; the coordination plane suffers a slight distortion as indicated by the average plane deviation of 0.058 Å. The methanolate O atoms occupy the axial positions. The coordination geometry is thus octahedral. In the title compound, the cations are linked by nitrate anions via N—H⋯O hydrogen bonds to form one-dimensional chains. Moreover, the one-dimensional structure is stabilized by intermolecular edge-to-face aromatic π–π interactions with a center-of-inversion at a distance of ca 4.634 Å.

The Mn III atom in the title complex, [Mn(C 11 H 10 N 3 O) 2 ]NO 3 , is coordinated by the two tridentate (2-pyridyl)(2-pyridylamino)methanolate ligands, forming a six-coordinate environment. The four pyridyl N atoms constitute the equatorial plane on which the manganese(III) ion lies; the coordination plane suffers a slight distortion as indicated by the average plane deviation of 0.058 Å . The methanolate O atoms occupy the axial positions. The coordination geometry is thus octahedral. In the title compound, the cations are linked by nitrate anions via N-HÁ Á ÁO hydrogen bonds to form one-dimensional chains. Moreover, the one-dimensional structure is stabilized by intermolecular edge-to-face aromaticinteractions with a center-of-inversion at a distance of ca 4.634 Å .

Experimental
Crystal data [Mn(C 11 Table 1 Selected bond lengths (Å ).   (Arulsamy & Hongson 1994). We report herein the synthesis and structure of the title compound.
The crystal structure of the complex cation shows two tridentate (2-pyridyl)bis(2-pyridylamino)-methanolate ligands coordinated facially to the Mn III ion to form a distorted octahedral geometry. The Mn III resides on a pseudo-twofold axis of symmetry and on an equatorial plane formed by the pyridyl N atoms of the two ligands ( Fig. 2, Table 2).

S2. Experimental
L 1 was synthesized following literature procedures (Arulsamy & Hongson 1994). 50% Mn(NO 3 ) 2 (0.356 g, 1 mmol) was added to a solution of L 1 (0.277 g, 1 mmol) in ehanol (20 ml); a brown solution formed over time with continuous stirring at room temperature. This solution was left to evaporate slowly at room temperature. After one week, brown block crystals of the title compound were isolated (yield: 0.1662 g, 60%).

Figure 1
The molecular structure of the title compound, with atom labels and 30% probability displacement ellipsoids.  The formation of the title compound.

Bis[(2-pyridyl)(2-pyridylamino)methanolato]manganese(III) nitrate
where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max = 0.001 Δρ max = 1.12 e Å −3 Δρ min = −0.47 e Å −3 Special details Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq