Interaction of cyclopentadienyl carbonyl phosphine complexes of manganese with Lewis acids. Infrared Spectra*

From IR-spectroscopic studies it is shown that phosphine derivatives of cyclopentadienylmanganese tricarbonyl interact reversibly with SnCl₄ and another Lewis acids in CH₂Cl₂ solution. The structures of the resulting complexes are discussed. Complex formation is favoured as the electron-donor properties of both the π-ring substituents and of the phosphine ligands attached to manganese atom are increased. The ability of Lewis acids to undergo such complex formation follows the series: SnCl₄ > SbCl₃ > HgCl₂ > GeCl₄.