Crystal structure of bis-[octa-kis-(di-methyl sulfoxide-κO)-ytterbium(III)] penta-bromido-plumbate(II) tribromide di-methyl sulfoxide monosolvate: a ytterbium-doped lead halide perovskite precursor.

Abstract

A mixture of PbBr2 and YbBr3·nH2O in a dimethyl sulfoxide (DMSO) solution yielded single crystals of a lead halide perovskite precursor with ytterbium, bis-[octa-kis-(di-methyl sulfoxide)-ytterbium(III)]penta-bromido-plumbate(II) tri-bromide with di-methyl sulfoxide as co-crystallite, [Yb(C2H6OS)8][PbBr5]0.5Br1.5·0.5C2H6OS. The complex ions PbBr5 3- and Yb(DMSO)8 3+ are present in the crystal together with three Br- ions and DMSO mol-ecules. X-ray crystallography revealed that the Br- ions in YbBr3 are replaced by the solvent and bound to a PbII atom or remain free. The presence of PbBr5 3- units, which are mol-ecular ions with a square-pyramidal structure, is also observed. These single crystals react with a caesium chloride solution, exhibiting near-infrared (NIR) luminescence by visible photoexcitation, suggesting the formation of Yb3+-doped lead halide perovskites (CsPbBr3-x Cl x ·Yb3+).