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The title compound, di-aqua-[tris-(2-amino-eth-yl)amine]-nickel(II) hexa-aqua-nickel(II) bis-(sulfate), [Ni(C 6 H 18 N 4 )(H 2 O) 2 ][Ni(H 2 O) 6 ](SO 4 ) 2 or [Ni(tren)(H 2 O) 2 ][Ni(H 2 O) 6 ](SO 4 ) 2 , consists of two octa-hedral nickel complexes within the same unit cell. These metal complexes are formed from the reaction of [Ni(H 2 O) 6 ](SO 4 ) and the ligand tris-(2-amino-eth-yl)amine (tren). The crystals of the title compound are purple, different from those of the starting complex [Ni(H 2 O) 6 ](SO 4 ), which are turquoise. The reaction was performed both in a 1:1 and 1:2 metal-ligand molar ratio, always yielding the co-precipitation of the two types of crystals. The asymmetric unit of the title compound, which crystallizes in the space group Pnma , consists of two half Ni II complexes and a sulfate counter-anion. The mononuclear cationic complex [Ni(tren)(H 2 O) 2 ] 2+ comprises an Ni ion, the tren ligand and two water mol-ecules, while the mononuclear complex [Ni(H 2 O) 6 ] 2+ consists of another Ni ion surrounded by six coordinated water mol-ecules. The [Ni(tren)(H 2 O) 2 ] and [Ni(H 2 O) 6 ] subunits are connected to the SO 4  2- counter-anions through hydrogen bonding, thus consolidating the crystal structure.

acta crystallographica. section e, crystallographic communications

Crystal structure of a nickel compound comprising two nickel(II) complexes with different ligand environments: [Ni(tren)(H2O)2][Ni(H2O)6](SO4)2