Di-μ-oxido-bis({2-[(R,R)-(−)-(2-aminocyclohexyl)iminomethyl]-4-nitrophenolato-κ3 N,N′,O}oxidovanadium(V)) dimethyl sulfoxide disolvate

The title compound, [V2(C13H16N3O3)2O4]·2C2H6OS, is a centrosymmetric dimeric complex solvated by two dimethyl sulfoxide molecules. Each VV atom is six-coordinated by one oxide group, two N atoms and one O atom from the tridentate Schiff base ligand, and by two additional bridging O atoms in a distorted octahedral coordination geometry. Three atoms of the cyclohexane ring are each disordered over two sites, with occupancy factors of 0.501 (10) and 0.499 (10). C—H⋯O and N—H⋯O hydrogen bonds link the dimers and solvent molecules into a supramolecular network.

haloperoxidases (Carter-Franklin et al., 2003;Rehder et al., 2003), phosphomutases (Mendz, 1991) and nitrogenases (Eady, 2003). Moreover, investigation of vanadium(V) complexes with Schiff bases is prompted by the fact that these ligands are coordinated to the metal through O and N atoms, similar to the coordination environments of natural systems.
In the crystal structure, C-H···O and N-H···O hydrogen bonds link the dimers and solvent molecules into a supramolecular network (Table 2; Fig. 2).

S2. Experimental
The title compound was obtained in a template/complexation reaction analogous to that described for preparation of dioxidovanadium(V) complexes with Schiff base ligands (Kwiatkowski et al., 2003). resulting mixture (70 ml) for 2 h and its cooling to room temperature, the separated solids were filtered off, washed several times with ethanol, recrystallized from DMSO-EtOH mixture and dried over molecular sieves.

S3. Refinement
All H atoms were positioned geometrically and refined using a riding model, with C-H = 0.93-0.98 and N-H = 0.90 Å, and with U iso (H) = 1.2(1.5 for methyl group)U eq (C,N).

Figure 1
The molecular structure of the title compound, with displacement ellipsoids drawn at the 25% probability level. The arrangement of molecules in the title compound, viewed approximately along the a axis. Hydrogen bonds are represented by dashed lines.