STRUCTURE OF K3NA4H2[GDW10O36].21H2O

Tripotassium tetrasodium dihydrogen decatungstogadolinate henicosahydrate, K3Na4H2[GdW10O36].21H2O, consists of a decatungstogadolinate anion, three eight-nine coordinated K+ cations, four octahedrally coordinated Na+ cations, and water molecules of crystallization. The decatungstogadolinate anion is comprised Of two [W5O18]6- units which chelate to a central Gd3+ cation to give a tetragonal antiprismatic coordination. The Gd-O distances and W-O distances in the decatungstogadolinate anion are 2.37 (2)-2.49 (2) and 1.71 (2)-2.36 (3) angstrom, respectively.