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Intermetallic Cerium Compounds with Ordered U3Si2 Type Structure

  • Rainer Pöttgen , Artur Fugmann , Rolf-Dieter Hoffmann , Ute Ch. Rodewald and Dirk Niepmann
Published/Copyright: June 2, 2014
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Zeitschrift für Naturforschung B
From the journal Zeitschrift für Naturforschung B Volume 55 Issue 2

Abstract

New intermetallic cerium compounds Ce2T2Mg (T = Ni, Cu, Pd), C2T2Cd (T=Pd, Pt, Au), and C2T2Pb (T = Pt, Au) were prepared by reaction of the elements in sealed tantalum tubes in a high-frequency furnace. Most C2T2X (X = Mg, Cd, Pb) compounds are stable after annealing at about 1000 K, while Ce2Pd2Mg is obtained as single phase only after melting and quenching. A thermal treatment at about 1000 K leads to decomposition in CePdMg and CePd. The eight compounds were investigated by X-ray diffraction both as powders and single crystals, and most structures were refined from single crystal data. They adopt an ordered U3Si2 type structure with space group P4/mbm: a = 759.6(1), c = 376.71 (9) pm, wR2 = 0.0562, 294 F2 values, 12 parameters for Ce2Ni2Mg, a = 787.41(9), c = 387.23(7) pm, wR2 = 0.0438, 222 F2 values, 12 parameters for Ce2Cu2Mg, a = 777.14(8), c = 400.03(7) pm, wR2 = 0.0276, 221 F2 values, 13 parameters for Ce2Pd2.03Mg0.97, a = 777.90(6), c = 393.28(6) pm, wR2 = 0.0360,317 F2 values, 12 parameters for Ce2Pd2Cd, and a = 779.90(7), c = 389.97(7) pm, wR2 = 0.0453, 315 F2 values, 12 parameters for Ce2Pt2Cd. Refinement of the occupancy parameters revealed full occupancy for most sites. A mixed palladium/magnesium (97 % Mg / 3 % Pd) occupancy was observed only for the 2a site of Ce2Pd2.03Mg0.97, indicating a small homogeneity range for this compound. Ce2Au2Cd (a = 804.93(7), c =393.36(6) pm) and the plumbides Ce2Pt2Pb (a = 794.63(7), c = 381.50(6) pm) and Ce2Au2Pb (a = 810.70(7), c = 394.85(7) pm) were characterized through their Guinier powder data. The structures of the Ce2T2X compounds can be interpreted as an intergrowth of distorted AIB2 and CsCl related slabs of compositions CeT2 and CeX. The course of the lattice parameters and chemical bonding within the series of Ce2T2X compounds are briefly discussed.

Received: 1999-11-10
Published Online: 2014-6-2
Published in Print: 2000-2-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

Articles in the same Issue

  1. Sila-Substitution of the α-Amino Acid Proline: Synthesis of rac- and (R)-4,4-Dimethyl-4-sila-proline Ethyl Ester
  2. Synthesis and Crystal Structures of ATi[Nb6Cl18] Compounds (A = K, Rb, Cs, In, Tl)
  3. Optisch aktive Übergangsmetall-Komplexe, 122. Synthese von Palladium(II)-Schiff-Base-Komplexen -intramolekulare Wechselwirkungen / Optically Active Transition Metal Complexes, 122. Synthesis of Palladium (II) Complexes with Schiff Base Ligands -Intramolecular Interactions
  4. Intermetallic Cerium Compounds with Ordered U3Si2 Type Structure
  5. Electrochemical Synthesis of a 6-Coordinate Cadmium(II) Complex with N-Methylisatin N(4)-cyclohexylthiosemicarbazone
  6. Synthese und Kristallstruktur des Bromdifluormethyl-triphenyl- phosphoniumbromids, [(C6H5)3PCF2Br]+ Br- / Synthesis and Crystal Structure of Bromodifluoromethyl-triphenylphosphonium Bromide, [(C6H5)3PCF2Br]+ Br-
  7. Synthesis, Structure and Properties of Poly > [(N-(2-Hydroxyethyl)- N'-carboxymethyl-1,2-ethylenediamine-N, N'-Diacetato)copper(II) Hydrate], {[Cu(Hhedta)] · H2O }n
  8. Kristallstrukturen, Schwingungsspektren und Normalkoordinatenanalyse von cis-(n-Bu4N)2[ReBr4(NCS)2 ], cis-(n-Bu4N)2[ReBr4(NCSe)2] und cis-(n-Bu4N)2[ReBr4(NCS)(NCSe)] / Crystal Structures, Vibrational Spectra and Normal Coordinate Analyses of cis-(n-Bu4N)2[ReBr4(NCS)2], cis-(n-Bu4N)2[ReBr4(NCSe)2,] and cis -(n -Bu4N)2[ReBr4(NCS)(NCSe)]
  9. Bis(diphenylphosphanyl)amine and its Disulfide and Diselenide. Application of the INEPT-HEED Pulse Sequence for Measurement of 1J(31P, 15N) and Isotope Induced Chemical Shifts 1⊿ 14/15N(31P) at Natural Abundance of 15N
  10. Synthesis, Multinuclear (1H, 13C and 17O ) Magnetic Resonance Spectroscopy and Conformational Analysis of Some Substituted Aryl Naphthoates
  11. Substituent Influences on the Keto-Enol Tautomerism in 1-(2-Hydroxyphenyl)-3-α-and -β-naphthylpropane-1,3-diones Monitored by 1H and 13C NMR Spectroscopy
  12. Chiral Aryl Sulfonyl Hydantoins as Hypoglycemic Agents
  13. Endogenous Alkaloids in Man, Part 33. Dimethyl (2S,4S)-and (2R,4S)-5,5-Dimethyl-1,3-thiazolidine-2,4-dicarboxylates, Two Diastereomeric Glyoxylate-Derived Heterocycles
  14. The Inclusion of Carbon Disulfide in p-tert-Butylcalix[4]-and [6 ]arene - A Combined Crystallographic and Vibrational Spectroscopic Study
  15. Facile Regioselective Synthesis of 1,2,6,8-Tetraazaspiro[4.4]nona-2,6-dien-9-ones
  16. A New Triterpenoidal Saponin from the Bark of Guaiacum officinale L.
  17. Alternative Method for the Preparation of 4,5-Ethylenedithio-1,3-dithiole-2- thione and Related Compounds
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https://doi.org/10.1515/znb-2000-0204

Articles in the same Issue

  1. Sila-Substitution of the α-Amino Acid Proline: Synthesis of rac- and (R)-4,4-Dimethyl-4-sila-proline Ethyl Ester
  2. Synthesis and Crystal Structures of ATi[Nb6Cl18] Compounds (A = K, Rb, Cs, In, Tl)
  3. Optisch aktive Übergangsmetall-Komplexe, 122. Synthese von Palladium(II)-Schiff-Base-Komplexen -intramolekulare Wechselwirkungen / Optically Active Transition Metal Complexes, 122. Synthesis of Palladium (II) Complexes with Schiff Base Ligands -Intramolecular Interactions
  4. Intermetallic Cerium Compounds with Ordered U3Si2 Type Structure
  5. Electrochemical Synthesis of a 6-Coordinate Cadmium(II) Complex with N-Methylisatin N(4)-cyclohexylthiosemicarbazone
  6. Synthese und Kristallstruktur des Bromdifluormethyl-triphenyl- phosphoniumbromids, [(C6H5)3PCF2Br]+ Br- / Synthesis and Crystal Structure of Bromodifluoromethyl-triphenylphosphonium Bromide, [(C6H5)3PCF2Br]+ Br-
  7. Synthesis, Structure and Properties of Poly > [(N-(2-Hydroxyethyl)- N'-carboxymethyl-1,2-ethylenediamine-N, N'-Diacetato)copper(II) Hydrate], {[Cu(Hhedta)] · H2O }n
  8. Kristallstrukturen, Schwingungsspektren und Normalkoordinatenanalyse von cis-(n-Bu4N)2[ReBr4(NCS)2 ], cis-(n-Bu4N)2[ReBr4(NCSe)2] und cis-(n-Bu4N)2[ReBr4(NCS)(NCSe)] / Crystal Structures, Vibrational Spectra and Normal Coordinate Analyses of cis-(n-Bu4N)2[ReBr4(NCS)2], cis-(n-Bu4N)2[ReBr4(NCSe)2,] and cis -(n -Bu4N)2[ReBr4(NCS)(NCSe)]
  9. Bis(diphenylphosphanyl)amine and its Disulfide and Diselenide. Application of the INEPT-HEED Pulse Sequence for Measurement of 1J(31P, 15N) and Isotope Induced Chemical Shifts 1⊿ 14/15N(31P) at Natural Abundance of 15N
  10. Synthesis, Multinuclear (1H, 13C and 17O ) Magnetic Resonance Spectroscopy and Conformational Analysis of Some Substituted Aryl Naphthoates
  11. Substituent Influences on the Keto-Enol Tautomerism in 1-(2-Hydroxyphenyl)-3-α-and -β-naphthylpropane-1,3-diones Monitored by 1H and 13C NMR Spectroscopy
  12. Chiral Aryl Sulfonyl Hydantoins as Hypoglycemic Agents
  13. Endogenous Alkaloids in Man, Part 33. Dimethyl (2S,4S)-and (2R,4S)-5,5-Dimethyl-1,3-thiazolidine-2,4-dicarboxylates, Two Diastereomeric Glyoxylate-Derived Heterocycles
  14. The Inclusion of Carbon Disulfide in p-tert-Butylcalix[4]-and [6 ]arene - A Combined Crystallographic and Vibrational Spectroscopic Study
  15. Facile Regioselective Synthesis of 1,2,6,8-Tetraazaspiro[4.4]nona-2,6-dien-9-ones
  16. A New Triterpenoidal Saponin from the Bark of Guaiacum officinale L.
  17. Alternative Method for the Preparation of 4,5-Ethylenedithio-1,3-dithiole-2- thione and Related Compounds
  18. A Diterpenoid with a New Modified Abietane Skeleton from Salvia palaestina
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