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'Cobalt' in keywords Facet   Publication Year 1998  [X]
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1Author    Hk Wulff, Müller-BuschbaumRequires cookie*
 Title    Zur Kristallchemie der Kupfer(II)-ZinkteIlurate Cu5 Zn4Te3 0 18  
 Abstract    Cuj^Znj^TeOg, mit einer Notiz über Cul95Co1?5T e06 On the Crystal Chemistry of the Copper(II) Zinc Tellurates Cu5Zn4Te30 ,8 and Cu, 5Zn, 5Te06 with a Note on Cu, 5Co, 5Te06 L. Single crystals of Cu5Zn4Te30 , 8 (I), Cu, 5Zn, 5Te06 (II) and Cu, 5Co, 5Te06 (III) have been prepared and investigated by X-ray work. The structure of (I) was solved in the monoclinic space group C^-C2, a = 14.834(2), b = 8.801(1), c = 10.375(2) Ä, ß = 93.27(2)°, Z = 4. (II) and (III) crystallize with cubic symmetry, space group Th-Ia3, a{U) = 9.557(1), a(III) = 9.570(1) Ä, Z = 8. (I) shows a complicated structure formed by Te06 octahedra isolated from each other, Zn20 6 double tetrahedra and Zn20 8 double square pyramids. These polyhedra are incorporated into a network of edge and corner connected stretched C u06 octahedra. (II) and (III) are isotypic to Cu3T e06 and have a (Cu/M)30 6 octahedra network, statistically occupied by Cu2+ and Zn2+ or Cu_+ and Co2+. 
  Reference    (Z. Naturforsch. 53b, 53—57 [1998]; eingegangen am 27. Oktober 1997) 
  Published    1998 
  Keywords    Copper, Zinc, Cobalt, Tellurate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0053.pdf 
 Identifier    ZNB-1998-53b-0053 
 Volume    53 
2Author    Hans-Friedrich Klein, Alexandra Brand, Gerhard CordierRequires cookie*
 Title    Synthesis and Reactions with CO and C2H4 of Cobalt(I) Complexes Containing Trimethylphosphine and Chelating o-Diphenylphosphanyl- phenolate Ligands  
 Abstract    In tetracoordinate cobalt(I) halide compounds CoX(Ph2P ^ O H)(P M e3)2 (X = CI, Br) o-phos-phanylphenols PhaP^O H are coordinated as phosphane ligands. In the presence o f base chelat­ ing anions Ph2P ^ O _ give rise to pentacoordinate com plexes Co(Ph2 P ^ O)(P M e3)3. M olec­ ular structures are presented for both types o f compounds. The five-membered chelate ring in Co(Ph2P ^ O)(P M e3)3 is resistant to protonation, and ring-opening is not observed in the presence o f CO or C2H4. Replacing one o f the trimethylphosphanes by one o f the 7r-acceptor ligands affords fiuxional com plex m olecules which upon cooling attain definite ground-state geometries out o f a multitude o f possible isomers. 
  Reference    Z. Naturforsch. 53b, 307 (1998); received November 28 1997 
  Published    1998 
  Keywords    Cobalt, o-Phosphanylphenolate Complexes, Synthesis, Structure, Fluxionality 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0307.pdf 
 Identifier    ZNB-1998-53b-0307 
 Volume    53 
3Author    M. Staack, Hk Miiller-BuschbaumRequires cookie*
 Title    Kristallchemische Beziehungen von Co6 0 2  
 Abstract    [Te0 4 (CoAs0 5)2 ] zur Steinsalzstruktur von CoO mit einem Beitrag über magnetische Messungen an Co60 2[Te04(C oA s05)2] Crystal Chemical Relations o f Co60 2[T e04(C o A s0 5)2] to the Rocksalt Structure of CoO and a Contribution on M agnetic Measurements of Co60 9[T e04(C o A s0 5)-,] The recently investigated compound Co60 2[Te04(C oAs05)2 marks the first occurrence of a tellurate-arsenate additionally revealing the hitherto unknown pyro-cobaltoarsenate group CoAsO?. One oxygen is exclusively connected to octahedrally coordinated cobalt. It is shown that the structure of Co60 2[Te04(C oAs05)2] can be derived step by step from the rock salt structure of CoO. Magnetic measurements using the Faraday technique reveal Curie-Weiss behaviour between 88 and 325 K. Low temperature measurements by a SQUID magnetometer show antiferromagnetism and a relatively low NEEL temperature of 5 K compared to other Co(II) compounds. 
  Reference    Z. Naturforsch. 53b, 1109—1114 (1998); eingegangen am 12. Juni 1998 
  Published    1998 
  Keywords    Cobalt, Tellur, Oxide-Arsenate, Magnetism, Structure Relations 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1109.pdf 
 Identifier    ZNB-1998-53b-1109 
 Volume    53