Poly[[hexaaquatris[μ2-2,5-dihydroxy-1,4-benzoquinonato(2−)]diholmium(III)] octadecahydrate

Abstract

In the polymeric title compound, {[Ho2(C6H2O4)3(H2O)6]·18H2O}n, the HoIII ion is nine-coordinated by six O atoms derived from three bidentate 2,5-dihy­droxy-1,4-benzoquinonate (DHBQ2−) ligands and three O atoms from three water mol­ecules. The HoIII ions are connected via three ligands, resulting in the formation of a two-dimensional honeycomb layer parallel to the ab plane. The layer is racemic in which Δ- and Λ-coordination geometries around HoIII ions are alternately arranged. The asymmetric unit comprises a third of a HoIII ion, located on a threefold axis, one-half of a DHBQ2− ion, located on a centre of inversion, one coordinated water mol­ecule and three uncoordinated water mol­ecules.