Synthesis and Characterisation of Group 6 Metal Carbonyl Complexes of Bis(ferrocenylchalcogeno)propanes: X-Ray Crystal Structures of [Cr(CO)_4{FcTe(CH_2)_3TeFc}], [Mo(CO)_4{FcE(CH_2)_3E'Fc}] (E = E' = Se; E = Se, E' = Te; E = E' = Te), and [W(CO)_4{FcTe(CH_2)_3TeFc}] (Fc = [Fe(h~5-C_5H_5)(h~5-C_5H_4)])

摘要

Treatment of MI3 ( M = Sc, Y, Tm, and U) with three equivalents of KP3C2Bu2t in refluxing toluene led to the corresponding monomeric, formally eight coordinate, complexes [M(eta(5)-P3C2Bu2t)(2)(eta(2)-P3C2Bu2t)] in moderate yields. In the solid state the complexes, which are all iso-structural, display an interesting assembly of ligands comprising of one eta(2)-(bent) and two eta(5)-ligated triphospholyl rings. NMR studies indicate that the complexes are fluxional in solution. (C) 2008 Elsevier B.V. All rights reserved.