2,2'-Bipyridin-1-ium 3-nitro-benzene-sulfonate.

In the title compound, C(10)H(9)N(2) (+)·C(6)H(4)NO(5)S(-), the dihedral angle between the aromatic rings of the cation is 9.42 (7)°. In the crystal, the anions and cations are linked by C-H⋯O and N-H⋯O hydrogen bonds, generating R(2) (1)(5) and R(4) (4)(14) rings, respectively.

Diaqua-bis(ethyl-enediamine-κN,N')copper(II) 2,2'-dithio-dinicotinate sesquihydrate.

In the title compound, [Cu(C(2)H(8)N(2))(2)](C(12)H(6)N(2)O(4)S(2))·1.5H(2)O, there are two half-molecules of the cationic complex in the asymmetric unit. The Cu(2+) ions lie on inversion centres and are octa-hedrally coordinated by two ethyl-enediamine (en) and two aqua ligands in a typical Jahn-Teller distorted environment with the water O atoms in the axial positions.