From an Impurity to the Pure Compound – an Electron Microscopy Study

Kienle, Lorenz; Lukachuk, Mar’yana; Düppel, Viola; Mattausch, Hj.; Simon, Arndt

doi:10.1002/zaac.200700236

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…In the following, a series of representative results is reproduced. It should be mentioned that, even with an isotypic phase where Zn is replaced by Ga, similar results were obtained . No indications for ordering, such as superstructure reflections or diffuse scattering, were found in all [ uvw ] SAED patterns, with w ≠ 0; compare the examples in Figure .…”

Section: Resultssupporting

confidence: 71%

Gd₇I₁₂Zn: A Group 12 Atom in the Octahedral Gd₆ Cluster

et al. 2008

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The title compound was synthesized from Gd, GdI 3 and Zn under Ar atmosphere at 850 degrees C. It crystallizes in the space group R3 (No. 148) with lattice constants a=15.686(1) A and c=10.4882(8) A. The structure features isolated Zn-centered Gd 6 octahedra with all edges and corners capped by I atoms. The disorder of the Gd atoms is rationalized via electron microscopic techniques. A computational analysis using the extended Hückel method has been carried out in order to understand the bonding of this compound. The structure of isotypic La 7I12Co is also remarked (a=16.040(1) A and c=10.905(2) A).

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Section: Resultssupporting

confidence: 71%

Gd₇I₁₂Zn: A Group 12 Atom in the Octahedral Gd₆ Cluster

et al. 2008

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“…Tabelle 1). Die Realstruktur wurde daher mittels Elektronenmikroskopie untersucht 18. Atomkoordinaten und äquivalente isotrope Auslenkungsparameter sind in Tabelle 2 und ausgewählte Bindungslängen in Tabelle 3 zu finden.…”

Section: Ergebnisse Und Diskussionunclassified

SE₁₉(C₂)₃I₃₄ (SE = Y, Gd): Verbindungen mit diskreten SE₆I₁₂‐Clustern und isolierten SE‐Atomen

Schaloske

Kienle

Düppel

et al. 2009

Zeitschrift anorg allge chemie

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The compounds RE 19 (C 2 ) 3 I 34 (RE = Y, Gd) were prepared from RE, REI 3 and carbon in a molar ratio of 20:34:18 by the addition of three parts of REN at 920°C (Y) and 900°C (Gd), respectively, forming moisture sensitive, black shiny brittle polyhedra. X-ray single crystal investigations indicated the triclinic system and E value statistics showed P1, a = 9.3683(9) Å, b = 10.3410 (9) Å, c = 22.1726(20) Å, α = 79.104(10)°, β = 88.175(11)°, γ = 69.227(10)°for Y 19 (C 2 ) 3 I 34 and a = 9.4172(9) Å, b = 10.3390(10) Å, c = 22.3711(24) Å, α = 79.001(12)°, β = 88.320(12)°, γ = 69.250(11)°for Einleitung Das Konzept der Clusterkondensation hat sich als ein wertvolles Ordnungsprinzip für viele Strukturen metallreicher Verbindungen bewährt [1, 2], wobei die Strukturen einem generellen Muster folgen: Häufig können sie von Übergangsmetallclustern M 6 X 8 oder M 6 X 12 (X = Chalkogen, Halogen) mit oktaedrischen M 6 -Kernen abgeleitet werden. Während bei den 4d-und 5d-Metallen diese Cluster in der Regel leere M 6 -Kerne enthalten, werden die valenzelektronenarmen Cluster mit Seltenerdmetallen SE fast ausnahmslos durch zusätzliche endohedrale Atome oder Atomgruppen Z (C, C 2 , B, Si etc.) stabilisiert, bisweilen unter Verlust aller Metall-Metall-Bindungen zugunsten zentral gerichteter Bindungen mit den endohedralen Atomen.

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Pr₆C₂‐Doppeltetraeder in Pr₆C₂Cl₁₀ und Pr₆C₂Cl₅Br₅

Schaloske

Mattausch

Kienle

et al. 2008

Zeitschrift anorg allge chemie

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Pr6C2‐Bitetrahedra in Pr6C2Cl10 and Pr6C2Cl5Br5 The compounds Pr6C2Cl10 and Pr6C2Cl5Br5 are prepared by heating stoichiometric mixtures of Pr, PrCl3, PrBr3 and C in sealed Ta capsules at 810 − 820 °C. They form bulky transparent yellow to green and moisture sensitive crystals which have different structures: space groups C2/c, (a = 13.687(3) Å, b = 8.638(2) Å, c = 15.690(3) Å, β = 97.67(3)° for Pr6C2Cl10 and a = 13.689(1) Å, b = 10.383(1) Å, c = 14.089(1) Å, β = 106.49(1)° for Pr6C2Cl5Br5). Both crystal structures contain C‐centered Pr6C2 bitetrahedra, linked via halogen atoms above edges and corners in different ways. The site selective occupation of the halogen positions in Pr6C2Cl5Br5 is refined in a split model and analysed with the bond length‐bond strength formalism. The compound is further characterized via TEM investigations and magnetic measurements (μeff = 3.66 μB).

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From an Impurity to the Pure Compound – an Electron Microscopy Study

Cited by 4 publications

References 16 publications

Gd₇I₁₂Zn: A Group 12 Atom in the Octahedral Gd₆ Cluster

Gd₇I₁₂Zn: A Group 12 Atom in the Octahedral Gd₆ Cluster

SE₁₉(C₂)₃I₃₄ (SE = Y, Gd): Verbindungen mit diskreten SE₆I₁₂‐Clustern und isolierten SE‐Atomen

Pr₆C₂‐Doppeltetraeder in Pr₆C₂Cl₁₀ und Pr₆C₂Cl₅Br₅

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From an Impurity to the Pure Compound – an Electron Microscopy Study

Cited by 4 publications

References 16 publications

Gd7I12Zn: A Group 12 Atom in the Octahedral Gd6 Cluster

Gd7I12Zn: A Group 12 Atom in the Octahedral Gd6 Cluster

SE19(C2)3I34 (SE = Y, Gd): Verbindungen mit diskreten SE6I12‐Clustern und isolierten SE‐Atomen

Pr6C2‐Doppeltetraeder in Pr6C2Cl10 und Pr6C2Cl5Br5

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Gd₇I₁₂Zn: A Group 12 Atom in the Octahedral Gd₆ Cluster

Gd₇I₁₂Zn: A Group 12 Atom in the Octahedral Gd₆ Cluster

SE₁₉(C₂)₃I₃₄ (SE = Y, Gd): Verbindungen mit diskreten SE₆I₁₂‐Clustern und isolierten SE‐Atomen

Pr₆C₂‐Doppeltetraeder in Pr₆C₂Cl₁₀ und Pr₆C₂Cl₅Br₅