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Preparation and Crystal Structures of Ternary Rare Earth Silver and Gold Arsenides LnAgAs2 and LnAuAs2 with Ln = La–Nd, Sm, Gd, and Tb

  • Marcus Eschen and Wolfgang Jeitschko EMAIL logo
Published/Copyright: June 2, 2014
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Zeitschrift für Naturforschung B
From the journal Zeitschrift für Naturforschung B Volume 58 Issue 5

The 14 arsenides LnAgAs2 and LnAuAs2 (Ln = La-Nd, Sm, Gd, Tb) were prepared by reaction of stoichiometric mixtures of the elemental components at high temperatures and characterized by Xray diffractometry. The silver compounds LaAgAs2 and CeAgAs2 and the gold compounds LnAuAs2 (Ln = Ce-Nd, Sm, Gd, Tb) crystallize with HfCuSi2 type structure (P4/nmm, Z = 2). Of these, the structures of CeAgAs2 (a = 408.5(1), c = 1048.2(1) pm, conventional residual R = 0.017 for 261 structure factors and 12 variable parameters) and CeAuAs2 (a = 411.4(1), c = 1015.3(2) pm, R = 0.030 for 428 F values) were refined from four-circle diffractometer data. The silver compounds LnAgAs2 (Ln = Pr, Nd, Sm, Gd, Tb) are isotypic with the antimonide SrZnSb2 (Pnma, Z = 4) as demonstrated by a single-crystal structure refinement of PrAgAs2 (a = 2107.3(4), b = 401.7(1), c = 407.8(1) pm, R = 0.042 for 746 F values and 26 variables). The gold compound LaAuAs2 (I4/mmm, Z = 4, a = 416.9(1), c = 2059.5(3) pm, R = 0.038 for 303 F values and 13 variables) was found to be isotypic with the bismuthide SrZnBi2, again by a refinement from single-crystal diffractometer data. In the structures of CeAgAs2, LaAuAs2, and CeAuAs2 large displacement parameters perpendicular to the four-fold axes were found for one of the two arsenic positions. These structures could also be refined with split positions for these arsenic atoms, which allow for considerable As-As bonding, resulting in a formal charge of −1 for these atoms. Chemical bonding in these compounds can thus be rationalized by a simple model corresponding to the formula Ln+3T+1As−1As−3 (T = Ag, Au), where the superscripts indicate oxidation numbers.

Keywords: Rare Earth Compounds; Arsenides; Crystal Structure
Received: 2002-11-28
Published Online: 2014-6-2
Published in Print: 2003-5-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

Articles in the same Issue

  1. Organoaluminium and -Gallium Compounds with O-Oximato Substituents
  2. Three-Membered Ring Formation by Si···N Interactions in Aminosulfenylsilanes
  3. Einkristalle des Neodym(III)-meta-Borats Nd(BO2)3 und -ortho-Borats Nd[BO3]/Single Crystals of the Neodymium(III) meta-Borate Nd(BO2)3 and ortho-Borate Nd[BO3]
  4. Synthesis and Structure of 1-{2,2-Dimethyl-4,6-dioxo-5-(1-pyridinio)-1,3- dioxan-5-yl}pyridinium Ylide: A New Route to Meldrum’s Acid Derivatives
  5. The NaCl Adduct of the Iron-Indium Compound Fe2(CO)6(μ-CO)(μ-InR)2 [R = C(SiMe3)3] – a One-Dimensional Coordination Polymer with Sodium Oxygen Bridges
  6. On Attempts to Synthesize Lanthanide Complexes of the Dianionic Fluorenyl-alkoxo Ligand [C13H8-cyclo-C6H10-O]2-. Crystal Structure of (C13H9-cyclo-C6H10-O)LaI2(DME)2
  7. Zinc (Hydrogen-β-glutamate)-chloride Hydrate [Zn (β-GluH)Cl(H2O)], a One-dimensional Coordination Polymer
  8. Preparation and Crystal Structures of Ternary Rare Earth Silver and Gold Arsenides LnAgAs2 and LnAuAs2 with Ln = La–Nd, Sm, Gd, and Tb
  9. Synthese, Kristallstruktur und spektroskopische Charakterisierung von Bis(dimethylammonium)hexachlorotitanat [Me2NH2]2[TiCl6]/ Synthesis, Crystal Structure, and Spectroscopic Characterization of Bis(dimethylammonium) Hexachlorotitanate [Me2NH2]2[TiCl6]
  10. The Effect of High Energy Milling on the Solid State Synthesis of MnFe2O4 from Mixtures of MnO-Fe2O3 and Mn3O4-Fe2O3
  11. Behaviour of Bimetallic Pt-Pd Carbon-Supported Catalysts in Methanol Electrooxidation
  12. Crystal Structure and Magnetic Properties of a Dinuclear Iron(III) Doubly Oxygen Bridged Schiff Base Complex
  13. seco-Dolastanes from the Marine Brown Alga Dictyota dichotoma (Huds.) Lamour
  14. Large Scale Synthesis of 4’-(4-Bromophenyl)-2,2’:6’,2”-terpyridine and Nature of the Mysterious Green By-product
  15. C-Substituierte Cyclame aus Cyclotetrapeptiden [1]/ C-Substituted Cyclams from Cyclotetrapeptides [1]
  16. Synthesis of the Pyrrole-Imidazole Alkaloid Sventrin from the Marine Sponge Agelas sventres
  17. Carboxylic Acid Analogues of Fosmidomycin
  18. Effective Mummification Compounds Used in Pharaonic Egypt: Reactivity on Bone Alkaline Phosphatase
  19. 2-Amino-1,3-dimethylimidazolium 2,2-Dimethyl-4,6-dioxo-1,3-dioxanide. First Structural Characterisation of the Anion of Meldrum’s Acid [1]
  20. Vibrational Spectra of the Layered Compound [(VO2)2(4,4-bipy)0.5(4,4′- Hbipy)(PO4)]·H2O
  21. A Hydrogen Bonded Aluminium Alkoxide Hydroxide Aggregate Resulting from the Exposure of Methylaluminium Dichloride to Air
  22. Zinc Bis[μ-N,N′-chlorozinc-bis(N-trimethylsilylimino- diphenylphosphoranyl)- methanediide]: A Zinc Derivative of a Geminal Carbdianion
https://doi.org/10.1515/znb-2003-0508
Keywords for this article
Rare Earth Compounds; Arsenides; Crystal Structure

Articles in the same Issue

  1. Organoaluminium and -Gallium Compounds with O-Oximato Substituents
  2. Three-Membered Ring Formation by Si···N Interactions in Aminosulfenylsilanes
  3. Einkristalle des Neodym(III)-meta-Borats Nd(BO2)3 und -ortho-Borats Nd[BO3]/Single Crystals of the Neodymium(III) meta-Borate Nd(BO2)3 and ortho-Borate Nd[BO3]
  4. Synthesis and Structure of 1-{2,2-Dimethyl-4,6-dioxo-5-(1-pyridinio)-1,3- dioxan-5-yl}pyridinium Ylide: A New Route to Meldrum’s Acid Derivatives
  5. The NaCl Adduct of the Iron-Indium Compound Fe2(CO)6(μ-CO)(μ-InR)2 [R = C(SiMe3)3] – a One-Dimensional Coordination Polymer with Sodium Oxygen Bridges
  6. On Attempts to Synthesize Lanthanide Complexes of the Dianionic Fluorenyl-alkoxo Ligand [C13H8-cyclo-C6H10-O]2-. Crystal Structure of (C13H9-cyclo-C6H10-O)LaI2(DME)2
  7. Zinc (Hydrogen-β-glutamate)-chloride Hydrate [Zn (β-GluH)Cl(H2O)], a One-dimensional Coordination Polymer
  8. Preparation and Crystal Structures of Ternary Rare Earth Silver and Gold Arsenides LnAgAs2 and LnAuAs2 with Ln = La–Nd, Sm, Gd, and Tb
  9. Synthese, Kristallstruktur und spektroskopische Charakterisierung von Bis(dimethylammonium)hexachlorotitanat [Me2NH2]2[TiCl6]/ Synthesis, Crystal Structure, and Spectroscopic Characterization of Bis(dimethylammonium) Hexachlorotitanate [Me2NH2]2[TiCl6]
  10. The Effect of High Energy Milling on the Solid State Synthesis of MnFe2O4 from Mixtures of MnO-Fe2O3 and Mn3O4-Fe2O3
  11. Behaviour of Bimetallic Pt-Pd Carbon-Supported Catalysts in Methanol Electrooxidation
  12. Crystal Structure and Magnetic Properties of a Dinuclear Iron(III) Doubly Oxygen Bridged Schiff Base Complex
  13. seco-Dolastanes from the Marine Brown Alga Dictyota dichotoma (Huds.) Lamour
  14. Large Scale Synthesis of 4’-(4-Bromophenyl)-2,2’:6’,2”-terpyridine and Nature of the Mysterious Green By-product
  15. C-Substituierte Cyclame aus Cyclotetrapeptiden [1]/ C-Substituted Cyclams from Cyclotetrapeptides [1]
  16. Synthesis of the Pyrrole-Imidazole Alkaloid Sventrin from the Marine Sponge Agelas sventres
  17. Carboxylic Acid Analogues of Fosmidomycin
  18. Effective Mummification Compounds Used in Pharaonic Egypt: Reactivity on Bone Alkaline Phosphatase
  19. 2-Amino-1,3-dimethylimidazolium 2,2-Dimethyl-4,6-dioxo-1,3-dioxanide. First Structural Characterisation of the Anion of Meldrum’s Acid [1]
  20. Vibrational Spectra of the Layered Compound [(VO2)2(4,4-bipy)0.5(4,4′- Hbipy)(PO4)]·H2O
  21. A Hydrogen Bonded Aluminium Alkoxide Hydroxide Aggregate Resulting from the Exposure of Methylaluminium Dichloride to Air
  22. Zinc Bis[μ-N,N′-chlorozinc-bis(N-trimethylsilylimino- diphenylphosphoranyl)- methanediide]: A Zinc Derivative of a Geminal Carbdianion
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