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In the crystal structure of a hexanuclear Y3+ compound, the six Y3+ cations are arranged octahedrally around an μ6-O atom at the centre of the cationic complex. Each of the eight faces of the Y6 octahedron is capped by an μ3-OH group in the form of a distorted cube. The proximity of the cationic complexes and lattice water molecules leads to the formation of a three-dimensional hydrogen-bonded network of medium strength.