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.

A mixture of PbBr(2) and YbBr(3)·nH(2)O 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(C(2)H(6)OS)(8)][PbBr(5)](0.5)Br(1.5)·0.5C(2)H(6)OS. The complex ions PbBr(5) (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 YbBr(3) are replaced by the solvent and bound to a Pb(II) atom or remain free. The presence of PbBr(5) (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 Yb(3+)-doped lead halide perovskites (CsPbBr(3-x) Cl (x) ·Yb(3+)).