Synthesis, Structures, and Solution Dynamics of Mononuclear and Dinuclear (Eta5-Indenyl)rhodium Complexes of Octafluorocyclooctatetraene

摘要

The molecular structure of (indenyl)(1,2,5,6-eta-octafluorocyclooctatetraene)rhodium (5) has been determined. The crystal is triclinic. Analysis of the solid-state structure in terms of the degree of slip folding of the indenyl ligand indicates that the indenyl ligand is partially slipped toward eta cube-coordination and that octafluorocyclooctatetraene (OFCOT) is a slightly better acceptor ligand than ethylene. The slippage of the indenyl ligand in solution has also been analyzed from the 13C(1H)NMR spectral data for 5. Line-shape analysis of the variable-temperature 19F NMR spectrum of 5 allows a value of Ea for indenyl rotation of 8.6 + or - 0.8 kcal/mol to be calculated. Here we report the synthesis, structures, and solution dynamics of 5 and some dinuclear complexes derived from its reactions with the (indenyl) Rh fragment. Keywords: Rhodium compounds, Nuclear magnetic resonance, Hydrocarbons, X ray diffraction, Reprints. (aw)