Bis(3-nitro-phen-yl) sulfone.

The asymmetric unit of the title compound, C(12)H(8)N(2)O(6)S, an important diphenyl sulfone derivative, contains one half-mol-ecule; a mirror plane passes through the SO(2) group. The dihedral angle between the two symmetry-related benzene rings is 40.10 (13)°.

Bis(3-amino-phen-yl) sulfone acetonitrile solvate.

In the sulfone mol-ecule of the title compound, C(12)H(12)N(2)O(2)S·C(2)H(3)N, the two benzene rings are oriented at a dihedral angle of 80.69 (3)°. Weak intra-molecular C-H⋯O hydrogen bonds result in the formation of two five-membered rings, which both have envelope conformations.