Abstract
The mixed‐anionic hydride oxide chloride LiEu2HOCl2 with divalent europium was synthesized by the reduction of Eu2O3 with LiH in a LiCl flux at 750 °C for 4 d in silica‐jacketed niobium capsules. According to structure determination by single‐crystal X‐ray diffraction the yellow compound crystallizes in the orthorhombic space group Cmcm (a = 1492.30(11) pm, b = 570.12(4) pm, c = 1143.71(8) pm, Z = 8) with a crystal structure closely related to that one of the quaternary hydride oxide LiLa2HO3 and the hydride nitride LiSr2H2N. On the other hand it can also be derived from the PbFCl‐type structure of EuHCl showing astonishingly short Eu2+···Eu2+ contacts of 326 and 329 pm. Both crystallographically different Eu2+ cations have nine anionic neighbors, while all other ions (Li+, H–, O2– and Cl–) reside in six‐membered coordination spheres. LiEu2OCl2H exhibits a bright yellow luminescence with an emission maximum at 581 nm upon excitation at 440 nm.
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