Mass Spectra of Organometallic Compounds. IV. Some Mononuclear Fluorocarbon Derivatives of Transition Metals

Abstract

The mass spectra of the following fluorocarbon derivatives of transition metals have been investigated: (a) the perfluoroalkyl derivatives R_fMo (CO)₃C₅H₅ (R_f = CF₃ and C₃F₇); (b) the perfluoroacyl derivatives CF₃COM(CO)₃C₆H₅ (M = Mo and W), C₃F₇COM(CO)₃C₅H₅ (M = Mo and W), and C₃F₇COFe(CO)₂C₆H₆; (c) the perfluoraryl derivatives R_fFe(CO)₂C₅H₅ (R_f/ = C₆F₅, p-HC₆F₄, 3, 4-H₂C₆F₃, and p-CF₃C₆F₄); (d) the hexafluorobutyne derivatives [(CF₃)₂C]₃ MNCCH³ (M = Mo and W); and (e) the bis (trifluoromethyl)tetramethylbicyclo-[2.2,2] octatriene complexes C₁₄H₁₄F₆Fe (CO)₃ and C₅H₅CoC₁₄H₁₄F₆. Unusual features observed in these mass spectra include the following: (a) Evidence for elimination of the neutral metal fluoride fragments FeF₂ and C₅H₅CoF; (b) evidence for the elimination of neutral HF and CF₂ fragments; (c) evidence for the elimination of a bridge in the bicyclo [2,2,2] octatriene derivatives; (d) decarbonylation of R_fCOMo (CO)₃C₅H₅ compounds, but not their tungsten analogs, in the mass spectrometer; and (e) evidence for the eliminations of C₄F₄ and CH₃CN fragments in the mass spectra of the [(CF₃)₂C₂]₃MNCCH₃ complexes.

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