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'Rhenium' in keywords Facet   Publication Year 1993  [X]
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1993[X]
1Author    Iring Leichtweis, Reinhard Hasselbring, HerbertW. Roesky, M. Athias Noltemeyer, Axel Herzog, Herrn Prof, -Georg Hans, WagnerRequires cookie*
 Title    Synthesen und Strukturen sechsgliedriger Cyclometallaphosphazene von Tellur(IV) und Rhenium(VII) Syntheses and Structures of Six-Membered Cyclometallaphosphazenes Containing Tellurium(IV) and Rhenium(VII)  
 Abstract    The reactions o f the tridentate ligands (M e3S i),N C (4 -R Q H A)N P P h ,N S iM e, [(1): R = H, (2): R = C F 3] with Re2Ov yield the six-membered rings (4-R C 6H 4C N PPh2N R e 0 2IsI)2 [(3): R = H, (4): R = C F 3], The acyclic com pound M e3SiN C (4-C F3C6H 4)N P Ph2N R eÖ 2O SiM e3 (5) has been obtained by reaction o f 2 with Me^SiOReOy 2 reacts quantitatively with TeCl4 to form the metallacycle 4-C F3C6H4tN P P h 2N TeC lN • pyridine (6) • pyridine. The molecular structures o f 4 • CH 2C12 and 6 • pyridine • 0.5 toluene have been determined by X-ray diffraction. 
  Reference    Z. Naturforsch. 48b, 1234 (1993); eingegangen am 22. April 1993 
  Published    1993 
  Keywords    Inorganic Ring Systems, Tellurium, Rhenium 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1234.pdf 
 Identifier    ZNB-1993-48b-1234 
 Volume    48 
2Author    Sabine Niemann, Wolfgang JeitschkoRequires cookie*
 Title    The Crystal Structures of Re2Al, Re4Alu, and ReAl6  
 Abstract    of the rhenium aluminides Re4Aln and ReAl6 were obtained by reaction of rhenium with an excess of aluminum. Re4Aln was found to be isotypic with Mn4Alu. The MnAl6 type structure of ReAl6 was confirmed. The crystal structures of both compounds were refined from single-crystal X-ray data. Re4Aln :P l, Z = 1, a = 516.0(1) pm, b = 896.3(2) pm, c = 516.9(1) pm, a = 90.44(1)°, ß = 99.76(1)°, y = 105.17(1)°, V = 0.2271 nm3, R = 0.036 for 2315 structure factors and 74 variable parameters. ReAl6: Cmcm, Z = 4, a -761.0(1) pm, b = 660.5(1) pm, c = 903.4(1) pm, V = 0.4541 nm3, R = 0.013 for 711 F values and 23 variables. In both structures the rhenium atoms have ten aluminum neighbors at distances from 245 to 277 pm. The A l-A l distances cover the whole range from 251 to 362 pm rather continuously. The previously reported compound Re2Al with the tetragonal MoSi2-type struc­ ture has the lattice constants a = 298.1(1) pm, c = 958.4(4) pm, V = 0.08519 nm3. ReAl6 shows Pauli-paramagnetism. 
  Reference    Z. Naturforsch. 48b, 1767—1773 (1993); received June 161993 
  Published    1993 
  Keywords    Crystal Structure, Magnetic Susceptibility, Rhenium, Aluminum Well-crystallized samples 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1767.pdf 
 Identifier    ZNB-1993-48b-1767 
 Volume    48