Abstract

AbstractFaint yellow transparent single crystals of Eu4OCl6 (1) and Eu4OBr6 (2) grow from fluxes that emerge from reaction mixtures containing EuX3 (X  Cl, br), Eu2O3 and lithium metal in 6:1:8 molar ratios at elevated temperatures in tantalum ampoules. Both crystallize with the Ba4OCl6 type structure (hexagonal, P63mc, Z = 2, 1: a = 944.07(4), c = 715.60(4) pm and 2: a = 982.04(4), c = 749.69(5) pm) with „isolated”︁ O2− centered Eu4 tetrahedra.

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