[N′-(3-Methoxy-2-oxidobenzylidene-κO 2)benzohydrazidato-κ2 N′,O]tris(pyridine-κN)cobalt(III) perchlorate

In the mononuclear title compound, [CoIII(C15H12N2O3)(C5H5N)3]ClO4, the CoIII ion is coordinated by three pyridine molecules and one N′-(3-methoxy-2-oxidobenzylidene)benzohydrazidate Schiff base ligand in an O,N,O′-tridentate manner. The CoIII ion adopts a distorted CoN4O2 octahedral coordination environment.

In the mononuclear title compound, [Co III (C 15 H 12 N 2 O 3 )-(C 5 H 5 N) 3 ]ClO 4 , the Co III ion is coordinated by three pyridine molecules and one N 0 -(3-methoxy-2-oxidobenzylidene)benzohydrazidate Schiff base ligand in an O,N,O 0 -tridentate manner. The Co III ion adopts a distorted CoN 4 O 2 octahedral coordination environment.

Experimental
Crystal data [Co(C 15  Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1999); software used to prepare material for publication: SHELXL97 and publCIF (Westrip, 2010 The development of routes and strategies for the design and construction of Schiff base compounds are of great interest not only because of their intriguing structural motifs but also because of their important applications in antitumor activities (Ando et al., 2004), magnetochemistry , and so on. Acylhydrazone ligands are widely used to assemble coordination polymers, which have received a considerable interest over the last decade. From the structural point of view, selection of the Schiff base ligand 3-methoxysalicylaldehyde benzoylhydrazide(H 2 L) is a good choice for construction of coordination polymers with defined geometry and special properties, due to its containing a combination of nitrogen and oxygen donor atoms (Yu, Zhao et al., 2010). Some geometrically intriguing supramolecular structures derived from this ligand have been reported including structurally characterized species with Mn 2 , Cu 4 (Monfared et al., 2009), Fe 1  units among others. As a continuation of our efforts on this system, we report the synthesis and characterization of the title cobalt(III) compound.

Experimental
The 3-methoxysalicylaldehyde benzoylhydrazide ligand (H 2 L) was prepared in a manner similar to the reported procedures (Pouralimardan et al., 2007;Sacconi, 1954). The title compound was synthesized by adding Co(ClO 4 ) 2 .6H 2 O (0.2 mmol) to a solution of H 2 L (0.20 mmol) in methanol 20 ml. The resulting mixture was stirred at room temperature to afford a dark brown solution. After 10 min pyridine (1 ml) was added and the solution was stirred for 3 h. Slow evaporation of the resulting dark brown solution over three weeks afforded brown crystals of the product.
Crystal data [Co(C 15

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 Rfactors(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.