Sodium quercetin-8-sulfonate trihydrate

Abstract

The organic anion of the title compound, {[Na(C15H 9O10S)(H2O)2]·H2O} n {systematic name: poly[[diaqua-[-2-(3,4-dihydroxy-phenyl)-3,5,7-trihydroxy-4- oxo-4H-chromene-8-sulfon-ato]-sodium] monohydrate]}, has a nearly planar structure. The Na atom is six-coordinated by O atoms, two from water mol-ecules and four from the anion. The dihedral angle between the ring systems in the anion is 10.1 (1)°. Intra-molecular O - H⋯S and O - H⋯O inter-actions occur. In the crystal structure, an extensive network of classical inter-molecular O - H⋯S and O - H⋯O hydrogen bonds forms layers along the c axis.