Bis(8-hy­droxy­quinolinium) naphthalene-1,5-di­sulfonate tetra­hydrate

Abstract

The crystal structure of the organic salt features classical hydrogen-bonding inter­actions involving the 8-hy­droxy­quinolinium cation, the naphthalene-1,5-di­sulfonate anion and the two water mol­ecules of crystallization.

The inter­action between 8-hy­droxy­quinoline (8HQ, C₉H₇NO) and naphthalene-1,5-di­sulfonic acid (H₂NDS, C₁₀H₈O₆S₂) in aqueous media results in the formation of the salt hydrate bis­(8-hy­droxy­quinolinium) naphthalene-1,5-di­sulfonate tetra­hydrate, 2C₉H₈NO⁺·C₁₀H₆O₆S₂²⁻·4H₂O. The asymmetric unit comprises one protonated 8HQ⁺ cation, half of an NDS^2– dianion symmetrically disposed around a center of inversion, and two water mol­ecules. Within the crystal structure, these components are organized into chains along the [010] and [10

] directions through O—H⋯O and N—H⋯O hydrogen-bonding inter­actions, forming a di-periodic network parallel to (101). Additional stabilizing inter­actions such as C—H⋯O, C—H⋯π, and π–π inter­actions extend this arrangement into a tri-periodic network structure

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