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'Zirconium' in keywords Facet   Publication Year 1999  [X]
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1999[X]
1Author    EvgeniV. Avtomonov, KonstantinA. RufanovRequires cookie*
 Title    Zirconium Reagents for Organometallic Synthesis. Crystal Structures of ZrCl4*2Et20 and (Et2N)ZrCl3*Et20  
 Abstract    Reaction of 3 equivalents of ZrCU-2Et20 (1) with 1 equivalent of (Et^N ^Zr in diethyl ether readily affords crystalline (Et2N)ZrCl3-2Et20 (2) in almost quantitative yield. The product was characterised by elemental analysis and by 1H. 1 C NMR, and MS techniques. The reactivity of this reagent towards C-H acidic compounds has been studied using cyclopentadiene as a C-H acid. The crystal structures of both 1 and 2 have been determined by X-ray diffractometry. The coordination polyhedra reveal a nearly perfect octahedral geometry with a trans Et20 ligation for 1 and a cis one for 2. 
  Reference    Z. Naturforsch. 54b, 1563—1567 (1999); received July 7 1999 
  Published    1999 
  Keywords    Zirconium, Adducts, Amides, Organometallic Reagents, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1563.pdf 
 Identifier    ZNB-1999-54b-1563 
 Volume    54 
2Author    KurtO. Klepp, Andreas KolbRequires cookie*
 Title    Komplexe Chalkogenide der IVa Metalle mit niedrigdimensionalen anionischen Partialstrukturen. Darstellung und Kristallstruktur von K2ZrTe3 und Rb2ZrTe3 Complex Chalcogenides of the IVa Metals with Low Dimensional Anionic Partial Structures. Preparation and Crystal Structures of K2ZrTe3 and Rb2ZrTe3  
 Abstract    The isostructural compounds K2ZrTe3 and Rb2ZrTe3 were obtained at 1000°C by reacting K7Te and Rb9Te with stoichiometric amounts of Zr and Te. The compounds are monoclinic, mP24, space group P2,/c, Z = 4 with a = 9.089(3), b = 14.148(4), c = 6.986(3)Ä, ß = 105.90(1)° and a = 9.735(4), b = 14.300(7), c = 6.952(8) Ä, ß = 108.61(2)°, respectively. The crystal structure was determined from diffractometer data and refined to R = 0.030 for 1452 Fo's for K2ZrTe3 and R = 0.038 for 1131 Fo's for Rb2ZrTe3. The crystal structure is of a new type, characterized by infinite anionic chains, ^-[ZrTe3]2_ built up by octahedra sharing opposite faces which run along [001]. The mean Zr-Te bond lengths are 2.921 and 2.920 A, respectively. The alkali cations separating the chains are characterized by two different -distorted octahedral and pentagonal bipyramidal -chalcogen environments. E inleitung 
  Reference    Z. Naturforsch. 54b, 441 (1999); eingegangen am 9. November 1998 
  Published    1999 
  Keywords    Crystal Structure, Complex Chalcogenides, Tellurides, Zirconium, Pseudo-one-dimensional solids 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0441.pdf 
 Identifier    ZNB-1999-54b-0441 
 Volume    54 
3Author    Gissur Örlygsson, Bernd HarbrechtRequires cookie*
 Title    The Crystal Structure of WC Type ZrTe. Advantages in Chemical Bonding as Contrasted to NiAs Type ZrTe  
  Reference    Z. Naturforsch. 54b, 1125—1128 (1999); received May 20 1999 
  Published    1999 
  Keywords    Zirconium, Telluride, Crystal Structure, Electronic Structure, WC Type Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1125.pdf 
 Identifier    ZNB-1999-54b-1125 
 Volume    54