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'Tungsten' in keywords Facet   Publication Year 1999  [X]
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1Author    M. Karl, G. Seybert, W. Massa, K. DehnickeRequires cookie*
 Title    Die Kristallstruktur von [YbCl2(THF)5]+[WOCl4(TH F)]- Crystal Structure of [YbCl2(THF)5]+ [WOCl4(THF)]  
 Abstract    Blue moisture sensitive single crystals of [YbCl2(THF)5]+ [WOCl4(THF)]-were obtained as a by-product from the reaction of the ytter­ bium trisamide Yb[N(SiMe3)2]3 with tungsten he-xachloride in THF solution. The crystals were sui­ table for an X-ray crystal structure determination. Space group P2/c, Z = 2, lattice dimensions at 
  Reference    Z. Naturforsch. 54b, 1609—1610 (1999); eingegangen am 23. August 1999 
  Published    1999 
  Keywords    Ytterbium, Chloro-THF-Complex, Tungsten, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1609_n.pdf 
 Identifier    ZNB-1999-54b-1609_n 
 Volume    54 
2Author    Max Herberhold, Kurt Bauer, W. Olfgang, M. IliusRequires cookie*
 Title    Oligonuclear Tricarbonylchromium-and Tricarbonyltungsten Derivatives of Tris(l-cyclohepta-2,4,6-trienyl)phosphane, P(C7H7)3 , and Related Ligands  
 Abstract    A series of trinuclear carbonylmetal complexes of tri(l-cyclohepta-2,4,6-trienyl)phosphane, P(C? 1^ 7)3 (1), has been prepared by the reaction of P(SiM e3)3 with ^-tro p y liu m halfsand­ wich salts, [(7/7-C7H7)M (CO)3]BF4, (M = Cr, Mo, W). While phosphorus remains uncoor­ dinated in the chromium complex P[(?/6-C7Hv)Cr(CO)3]3 (2a), the molybdenum and tung­ sten analogues, P[(//4-C7H 7)M (CO)3][(??6-C7H7)M(CO)3]2 (M = Mo (2b), W (2c)), contain a coordinated phosphorus atom together with a //4-norcaradienyl substituent. Reaction of 2a with pentacarbonylmetal fragments, [M(CO)s], leads to trinuclear products, P[(/;2-C7H7)M-(CO)4][(> 7/6-C7H7)M(CO)3]2 (M = Cr (5a), W (5c)), in which phosphorus is coordinated next to an //'-cycloheptatrienyl substituent. Several alkyl-and arylphosphanes containing [(^6-C7H7)Cr(CO)3] substituents (X), e. g. Ph2P(X) (6a), RP(X)2 (R = Me (7a), CH2Ph (8a), Ph (9a)) and (X)2P(R')P(X)2 (R' = methylene (10a) or o-phenylene (11a)), have also been synthesized. The chromium complexes 6a -11a contain an uncoordinated phosphorus center, but in contrast to 9a, the corresponding tungsten compound PhP[(?;4-C7H7)W (CO)3][(?/6-C7H7)W(CO)3]2 (9c) has again a structure similar to 2c. The arsenic complexes, As[(?/6-C7H7)M(CO)3]3 (M = Cr (12a), W (12c)) both contain an uncoordinated arsenic center, analogous to 2a. The molecular structures of all new complexes in solution at room temperature were deduced from a consistent set of 'H, l,C and 31P NM R data, and X-ray structure determinations were carried out for 2a and 5c. 
  Reference    (Z. Naturforsch. 54b, 63—72 [1999]; received August 3 1998) 
  Published    1999 
  Keywords    Halfsandwich Compounds, Cycloheptatrienyl Complexes, Chromium, Tungsten, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0063.pdf 
 Identifier    ZNB-1999-54b-0063 
 Volume    54