2,2'-Bipyridine 1,1'-Dioxide

The title molecule, C₁₀H₈N₂O₂, lies on a crystallographic twofold axis. The dihedral angle between the planes of the pyridine groups is 67.5° and the non-bonded distance between the O atoms in the N-oxide groups is 3.046 (2) Å. Although the skew conformation of the skeleton is almost the same as that of the coordinated form, the dihedral angle is the largest among the corresponding values for the 2,2'-bipyridine 1,1'-dioxide complexes.