Synthesis and characterization of π cyclopentadienyl complexes of manganese and iron with one to five fluorosilyl substituents. Crystal and molecular structures of [Mn(CBr{SiMeF})(CO)] and [Mn(C{SiMeF})(CO)].

The reaction of AgSbF with the cymantrenyl hydrosilanes [Mn{CBr(SiMeH)}(CO)] ( = 1-5) gives the corresponding fluorosilanes. With the ferrocenylhydrosilanes [Fe{CBr(SiMeH)}(CH)] fluorination and oxidation to give the ferricenium salts [Fe{CBr(SiMeF)}(CH)]SbF ( = 1-5) occurs. Reaction of the latter with cobaltocene gives the corresponding neutral fluorosilanes. All compounds were characterized by a combination of NMR methods (H, C{H} and F; sometimes also Si) and in part as well by IR and HR mass spectrometry. The reactivity of the cymantrenyl fluorosilanes towards carbanions and MeOH was studied. X-ray diffraction analysis of [Mn{CBr(SiMeF)}(CO)] ( = 4-5) shows paddle-wheel orientations of the SiMeF groups.