N,N′-Bis(2-amino­benz­yl)ethane-1,2-diaminium bis­(4-methyl­benzene­sulfonate)

The title salt, C(16)H(24)N(4) (2+)·2C(7)H(7)O(3)S(−), crystallizes with the dication situated on an inversion center and the anion in a general position. The cation contains two ammonium and two free amine groups, and the observed conformation for the chain linking the benzene rings is different from that found in the free tetra­amine and in the fully protonated tetra­amine. All amine and ammonium H atoms of the cation form hydrogen bonds with eight symmetry-related anions, using the sulfonate O atoms as acceptors. This arrangement for the ions precludes any π–π contacts between benzene rings in the crystal.