Go toArchive
Browse byFacets
Bookbag ( 0 )
'Uranium Organyls' in keywords
Results  2 Items
Sorted by   
Publication Year
1983 (1)
1978 (1)
1Author    R. D. Fischer, E. Klähne, J. KopfRequires cookie*
 Title    Halogeno-und Pseudohalogeno-tris(pentahaptocyclopentadienyl)uran(IV)- Komplexe als Lewis-Säuren: Darstellung und Struktur trigonal-bipyramidaler Uran-Organyle des Typs [(rj 5 -C5H5)3UXL] Tris(pentahaptocyclopentadienyl)uranium(IV) Halides and Pseudohalides as Lewis-Acids: Preparation and Structure of Uranium Organyls [(^-C5H5)3UXL] with Trigonal-Bipyramidal Coordination  
 Abstract    The first two examples of a novel series of organo-actinide complexes, [CpsUXL] (Cp = r/ 5 -CoH5, X = halide or pseudohalide anion, L = uncharged Lewis base), are described. The X-ray structure analysis of the system with X = NCS and L = CH3CN confirms an almost linear alignment (H3)CCNUNCS along with the coplanarity of the three Cp ring normals. The remarkable Lewis acidity of certain CpsUX-compounds appears to be essential for the formation of oligomeric species [Cp3UX]oo as well as for specific reactions of monomeric CP3UX. 
  Reference    Z. Naturforsch. 33b, 1393—1397 (1978); eingegangen am 17. Juli 1978 
  Published    1978 
  Keywords    Uranium Organyls, Cyclopentadienyl Ligand, Crystal Structure 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1393.pdf 
 Identifier    ZNB-1978-33b-1393 
 Volume    33 
2Author    R. Dieter Fischer+, Kenan YünlüRequires cookie*
 Title    Zum ambidenten Charakter des Cyanotrihydroborat-Liganden in Uran(IV)-Organylen On the Ambident Nature of the Cyanotrihydroborate Ligand in Organouranium(IV) Complexes  
 Abstract    Both the acceptedly oligomeric complex [(CsHs^U^-NCBHs)],} (1) and its hitherto unknown, appreciably more soluble and volatile homologue, [(CHaCaH^U^-NCBHa)]« (2), display NIR/VIS spectra typical of trigonal bipyramidal (tbp) metal coordination in the solid state, but of pseudotetrahedral (v>-Td) coordination e.g. in CH2CI2 and C6H5CH3 solution. The X H NMR spectra of 2 in these non coordinating solvents can be best explained in terms of temperature dependent equilibria involving the two rapidly interconverting y-Td-isomers (CHgCsH^U^-HaBCN) and (CH3C5H4)3UNCBH3. A reversible colour change: green ^ brown at 130-150 °C also suggests the facile rupture of U-H and U-N bonds, respectively, in thermally excited, polycrystalline (2). 
  Reference    Z. Naturforsch. 38b, 1369—1374 (1983); eingegangen am 6. Juli 1983 
  Published    1983 
  Keywords    Uranium Organyls, Cyanotrihydroborate Ligand, NMR of Paramagnetic Species, Solution Equilibria 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1369.pdf 
 Identifier    ZNB-1983-38b-1369 
 Volume    38