Bis{4-[(Z)-N′-(4-hydroxybenzylidene)hydrazino]-8-(trifluoromethyl) quinolinium} sulfate dihydrate

Abstract

The title compound, 2C17H13F3N3O+·SO4 2-·2H2O, crystallizes with four independent cations (A, B, C and D) in the asymmetric unit, which is composed of two groups of two cations, one anion and two water mol-ecules (Z′ = 2). The dihedral angle between the mean planes of the 4-hydroxy-phenyl and quinolinium groups is 8.9 (7)°in A, 30.1 (6)°in B, 28.8 (8)°in C and 12.8 (1)°in D. The crystal packing is stabilized by inter-molecular O - H⋯O and N - H⋯O hydrogen bonding between H atoms from 4-hydroxy-phenyl O atoms and the O atoms of nearby water molecules and sulfate anions, as well as H atoms from the N atom of the hydrazino group to O atoms of neighboring sulfate anions, linking the components into chains with the 4-hydroxy-phenyl and quinolinium rings parallel to the (011) plane. There is also an extensive array of inter-molecular hydrogen bonds between water mol-ecules themselves and with sulfate O atoms, as well as hydrogen-bond inter-actions between H atoms from the hydrazino group and sulfate O atoms. In addition, inter-molecular π-π stacking inter-actions occur between nearby 4-hydroxy-phenyl and quinolinium groups, with distances between the centroids of inter-acting rings in the range 3.4140 (9)-3.9659 (9) Å. © 2008 International Union of Crystallography.