Crystal structures of isomeric 4-bromo-N-[(2-nitro­phen­yl)sulfon­yl]benzamide and 4-bromo-N-[(4-nitro­phen­yl)sulfon­yl]benzamide

The syntheses and crystal structures of the isomeric 4-bromo-N-[(2-nitro­phen­yl)sulfon­yl]benzamide, (I), and 4-bromo-N-[(4-nitro­phen­yl)sulfon­yl]benzamide, (II), are described (mol­ecular formula = C(13)H(9)BrN(2)O(5)S in each case). The asymmetric unit of (I) contains two independent mol­ecules [(IA) and (IB)], while that of (II) contains one mol­ecule. The benzoic acid aromatic ring of mol­ecule (IA) is disordered due to rotation about the C(ar)—C(=O) bond over two orientations in a 0.525 (9):0.475 (9) ratio. The dihedral angle between the benzene rings is 85.9 (3)° in (IA) and 65.22 (19)° in (IB), while in (II), the corresponding value is 56.7 (7)°. In the crystals of (I) and (II), N—H⋯O, C—H⋯O and C—H⋯π inter­actions generate three-dimensional networks.