Thermal decarbonylation of the acyl compounds [Mn(CO) (COR )] (R =CF , CHF , CH CF , CF CH ) yielded the corresponding alkyl derivatives [Mn(CO) (R )], some of which have not been previously reported. The compounds were fully characterized by analytical and spectroscopic methods and by several single-crystal X-ray diffraction studies. The solution-phase IR characterization in the CO stretching region, with the assistance of DFT calculations, has allowed the assignment of several weak bands to vibrations of the [Mn( CO) (eq- CO)(R )] and [Mn( CO) (ax- CO)(R )] isotopomers and a ranking of the R donor power in the order CF
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