| Intermetallics as zintl phases: Yb2Ga4Ge6 and RE3Ga4Ge6 (RE=Yb, Eu): structural response of a [Ga4Ge6]4- framework to reduction by two electrons. | |
| | |
MedLine Citation:
|
PMID: 15224328 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
|
Two new intermetallic compounds, Yb(2)Ga(4)Ge(6) and Yb(3)Ga(4)Ge(6), were obtained from reactions in molten Ga. A third compound, Eu(3)Ga(4)Ge(6), was produced by direct combination of the elements. The crystal structures of these compounds were studied by single-crystal X-ray diffraction. Yb(2)Ga(4)Ge(6) crystallizes in an orthorhombic cell with a=4.1698(7), b=23.254(4), c=10.7299(18) A in the polar space group Cmc2(1). The structure of RE(3)Ga(4)Ge(6) is monoclinic, space group C2/m, with cell parameters a=23.941(6), b=4.1928(11), c=10.918(3) A, beta=91.426(4) degrees for RE=Yb, and a=24.136(2), b=4.3118(4), c=11.017(1) A, beta=91.683(2) degrees for RE=Eu. The refinement [I>2 sigma(I)] converged to the final residuals R(1)/wR(2)=0.0229/0.0589, 0.0411/0.1114, and 0.0342/0.0786 for Yb(2)Ga(4)Ge(6), Yb(3)Ga(4)Ge(6), and Eu(3)Ga(4)Ge(6), respectively. The structures of these two families of compounds can be described by a Zintl concept of bonding, in which the three-dimensional [Ga(4)Ge(6)](n-) framework serves as a host and electron sink for the electropositive RE atoms. The structural relation of RE(3)Ga(4)Ge(6) to of Yb(2)Ga(4)Ge(6) lies in a monoclinic distortion of the orthorhombic cell of Yb(2)Ga(4)Ge(6) and reduction of the [Ga(4)Ge(6)] network by two electrons per formula unit. The results of theoretical calculations of the electronic structure, electrical transport data, and thermochemical and magnetic measurements are also reported. |
| | |
Authors:
|
Marina A Zhuravleva; James Salvador; Daniel Bilc; Subhendra D Mahanti; John Ireland; Carl R Kannewurf; Mercouri G Kanatzidis |
Related Documents
:
|
2069768 - Structure of an unusually non-polar hydroxy ether. 22467338 - Effects of alkali metal ion cationization on fragmentation pathways of triazole-epothil... 7805058 - Conformational features of rhamnopyranose derivatives. the molecular structure of methy... 18533628 - Synthesis and characterization of aluminum- and gallium-bridged [1.1]chromarenophanes a... 15299368 - Accuracy and precision in protein crystal structure analysis: two independent refinemen... 20422098 - Synthesis and dna photocleavage study of ru(bpy)(3)(2+)-(ch(2))(n)-mv(2+) complexes. |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Chemistry (Weinheim an der Bergstrasse, Germany) Volume: 10 ISSN: 0947-6539 ISO Abbreviation: Chemistry Publication Date: 2004 Jul |
Date Detail:
|
Created Date: 2004-06-29 Completed Date: 2005-04-19 Revised Date: 2009-08-04 |
Medline Journal Info:
|
Nlm Unique ID: 9513783 Medline TA: Chemistry Country: Germany |
Other Details:
|
Languages: eng Pagination: 3197-208 Citation Subset: - |
Affiliation:
|
Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA, Fax: (+1) 517-353-1793. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Long-lived charge-separated state generated in a ferrocene-meso,meso-linked porphyrin trimer-fullere...
Next Document: Does a reinforced kinetic macrocyclic effect exist? the demetallation in strong acid of copper(II) C...