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

Abstract

In the title salt, [Ni(en)(H₂O)₄]²⁺·NDS²⁻·2H₂O, the Ni²⁺ cation is positioned on a twofold rotation axis and exhibits a coordination number of six. The components are connected through an extensive network of O—H⋯O and N—H⋯O hydrogen bonds, and C—H⋯π inter­actions.

The reaction of ethane-1,2-di­amine (en, C₂H₈N₂), the sodium salt of naphthalene-1,5-di­sulfonic acid (H₂NDS, C₁₀H₈O₆S₂), and nickel sulfate in an aqueous solution resulted in the formation of the title salt, [Ni(C₂H₈N₂)(H₂O)₄](C₁₀H₆O₆S₂)·2H₂O or [Ni(en)(H₂O)₄](NDS)·2H₂O. In the asymmetric unit, one half of an [Ni(en)(H₂O)₄]²⁺ cation and one half of an NDS²⁻ anion, and one water mol­ecule of crystallization are present. The Ni²⁺ cation in the complex is positioned on a twofold rotation axis and exhibits a slight tetra­gonal distortion of the cis-NiO₄N₂ 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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