Tetraaqua(ethane-1,2-diamine-κ² <i>N</i>,<i>N</i>′)nickel(II) naphthalene-1,5-disulfonate dihydrate

The reaction of ethane-1,2-diamine (en, C 2 H 8 N 2 ), the sodium salt of naphthalene-1,5-disulfonic acid (H 2 NDS, C 10 H 8 O 6 S 2 ), and nickel sulfate in an aqueous solution resulted in the formation of the title salt, [Ni(C 2 H 8 N 2 )(H 2 O) 4 ](C 10 H 6 O 6 S 2 )·2H 2 O or [Ni(en)(H 2 O) 4 ](NDS)·2H 2 O. In the asymmetric unit, one half of an [Ni(en)(H 2 O) 4 ] 2+ cation and one half of an NDS 2− anion, and one water molecule of crystallization are present. The Ni 2+ cation in the complex is positioned on a twofold rotation axis and exhibits a slight tetragonal distortion of the cis -NiO 4 N 2 octahedron, with an Ni—N bond length of 2.0782 (16) Å, and Ni—O bond lengths of 2.1170 (13) Å and 2.0648 (14) Å. The anion is completed by inversion symmetry. In the extended structure, the cations, anions, and non-coordinating water molecules are connected by intermolecular N—H...O and O—H...O hydrogen bonding, as well as C—H...π interactions, forming a three-dimensional network.

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