Halogeno-und Pseudohalogeno-tris(pentahaptocyclopentadienyl)uran(IV)- Komplexe als Lewis-Säuren: Darstellung und Struktur trigonal-bipyramidaler Uran-Organyle des Typs [(η5 -C₅H₅)₃UXL] / Tris(pentahaptocyclopentadienyl)uranium(IV) Halides and Pseudohalides as Lewis-Acids: Preparation and Structure of Uranium Organyls [(η5 -C₅H₅)₃UXL] with Trigonal-Bipyramidal Coordination

Abstract

Abstract The first two examples of a novel series of organo-actinide complexes, [Cp 3 UXL] (Cp = η 5 -C 5 H 5 , X = halide or pseudohalide anion, L = uncharged Lewis base), are described. The X-ray structure analysis of the system with X = NCS and L = CH 3 CN confirms an almost linear alignment (H 3 )CCNUNCS along with the coplanarity of the three Cp ring normals. The remarkable Lewis acidity of certain Cp 3 UX-compounds appears to be essential for the formation of oligomeric species [Cp 3 UX] ∞ as well as for specific reactions of monomeric CP 3 UX.