Affiliation:
1. Institute for Inorganic Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany
2. Leuchtstoffwerk Breitungen GmbH, D-98597 Breitungen, Germany
Abstract
It was possible to synthesize colorless single crystals of La5Cl3[SbO3]4 (block-shaped) as well as La2Sb12O19Br4 and La2Sb12O19I4 (both needle-shaped), representing three new compounds from the system of lanthanum oxoantimonate(III) halides, which have not been described in the literature before. La5Cl3[SbO3]4 crystallizes in the monoclinic space group P2/c with the lattice parameters a = 895.82(5) pm, b = 564.28(3) pm, c = 1728.19(9) pm, and β = 90.007(2)° for Z = 2. This layered compound contains isolated ψ1-tetrahedral [SbO3]3– units, square hemiprisms [LaO8]13–, and antiprisms [LaO4Cl4]9−. La2Sb12O19Br4 and La2Sb12O19I4 crystallize isotypically in the orthorhombic space group Pnma with a = 3184.69(19) pm, b = 417.78(3) pm, c = 1019.85(6) pm for the bromide and a = 3215.08(19) pm, b = 419.94(3) pm, c = 1062.89(6) pm for the iodide. Instead of isolated [SbO3]3− anions, semi-tubular features 1∞{[Sb12O19]2−} are present, which consist mainly of [SbO4]5− and few [SbO3]3− units with stereochemically active electronic lone pairs at their Sb3+ centers. Within these so-called “double-halfpipes”, La3+ is surrounded by nine oxygen atoms as [LaO9]15– polyhedron without any contact with X− anions. Single-crystal Raman measurements were performed for La5Cl3[SbO3]4 and La2Sb12O19I4, and La5Cl3[SbO3]4 was structurally compared with the isostoichiometric, but not isotypic La5F3[SbO3]4.
Funder
State of Baden-Württemberg
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering
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