[N,N-Bis(2-amino­eth­yl)ethane-1,2-diamine](ethane-1,2-diamine)­nickel(II) thio­sulfate trihydrate

The title compound, [Ni(C(2)H(8)N(2))(C(6)H(18)N(4))]S(2)O(3)·3H(2)O, was accidentally synthesized under solvothermal conditions applying [Ni(en)(3)]Cl(2) (en is ethane-1,2-diamine) as the Ni source. The asymmetric unit consists of one discrete [Ni(tren)(en)](2+) complex [tren is N,N-bis­(2-amino­eth­yl)ethane-1,2-diamine] in which the Ni(2+) cation is sixfold coord­inated within a slightly distorted octa­hedron, one thio­sulfate anion and three water mol­ecules. In the crystal, the complex cations, anions and water mol­ecules are linked by an intricate hydrogen-bonding network. One C atom of the tren ligand, as well as one O atom of a water mol­ecule, are disordered over two sites and were refined using a split model (occupancy ratios = 0.85:15 and 0.60:0.40, respectively).