Magnesium and barium in two substructures: BaTMg2 (T = Pd, Ag, Pt, Au) and the isotypic cadmium compound BaAuCd2 with MgCuAl2 type structure
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Maximilian Kai Reimann
Abstract
The intermetallic barium compounds BaTMg2 (T = Pd, Ag, Pt, Au) and BaAuCd2 were synthesized by reactions of the elements in sealed tantalum ampoules in muffle furnaces. The five compounds crystallize with the orthorhombic MgCuAl2 type structure, space group Cmcm, with small differences in chemical bonding between the magnesium and cadmium series. All samples were characterized through their Guinier powder diffraction patterns. The structures of BaPdMg2 (a = 444.57(4), b = 1174.67(10), c = 827.58(7) pm, wR2 = 0.0460, 475 F2 values, 16 variables), BaAuMg2 (a = 450.27(6), b = 1183.94(16), c = 838.76(11) pm, wR2 = 0.0355, 473 F2 values, 16 variables) and BaAuCd2 (a = 463.31(5), b = 1112.79(12), c = 826.63(8) pm, wR2 = 0.0453, 469 F2 values, 16 variables) were refined from single crystal X-ray diffraction data. The large barium atoms push the [TMg2] respectively [AuCd2] substructures apart. This allows fast moisture attack and leads to fast hydrolyzes of the samples when they get in contact with water. The influence of the difference in electronegativity between magnesium and cadmium is reflected for the pair of compounds BaAuMg2 and BaAuCd2. The magnesium compound shows the higher auridic character, while the cadmium compound shows a tendency towards a three-dimensional cadmium substructure.
Acknowledgements
We thank Dipl.-Ing. J. Kösters for collecting the single crystal data sets.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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© 2022 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- In this issue
- Inorganic Crystal Structures (Original Paper)
- A contribution to the perrhenate crystal chemistry: the crystal structures of new CdTh[MoO4]3-type compounds
- Mixed-valent 1:1 oxidotellurates(IV/VI) of Na, K and Rb: superstructure and three-dimensional disorder
- Structure and properties of phases from solid solutions YTIn1−x Al x (T = Ni and Cu)
- Halide-sodalites: thermal behavior at low temperatures and local deviations from the average structure
- Structural study of ceramic samples of the PbTiO3–BaTiO3–BaZrO3 system with a high PbTiO3 content studied by the Rietveld method
- A novel crystallographic location of rattling atoms in filled Eu x Co4Sb12 skutterudites prepared under high-pressure conditions
- Magnesium and barium in two substructures: BaTMg2 (T = Pd, Ag, Pt, Au) and the isotypic cadmium compound BaAuCd2 with MgCuAl2 type structure
- Organic and Metalorganic Crystal Structures (Original Paper)
- Synthesis, structure, and photocatalytic properties of a two-dimensional uranyl organic framework
Artikel in diesem Heft
- Frontmatter
- In this issue
- Inorganic Crystal Structures (Original Paper)
- A contribution to the perrhenate crystal chemistry: the crystal structures of new CdTh[MoO4]3-type compounds
- Mixed-valent 1:1 oxidotellurates(IV/VI) of Na, K and Rb: superstructure and three-dimensional disorder
- Structure and properties of phases from solid solutions YTIn1−x Al x (T = Ni and Cu)
- Halide-sodalites: thermal behavior at low temperatures and local deviations from the average structure
- Structural study of ceramic samples of the PbTiO3–BaTiO3–BaZrO3 system with a high PbTiO3 content studied by the Rietveld method
- A novel crystallographic location of rattling atoms in filled Eu x Co4Sb12 skutterudites prepared under high-pressure conditions
- Magnesium and barium in two substructures: BaTMg2 (T = Pd, Ag, Pt, Au) and the isotypic cadmium compound BaAuCd2 with MgCuAl2 type structure
- Organic and Metalorganic Crystal Structures (Original Paper)
- Synthesis, structure, and photocatalytic properties of a two-dimensional uranyl organic framework
