Transition-metal fluorocarbon complexes. Part I. Derivatives of perfluoro-olefins

The interaction of tri-iron dodecacarbonyl, Fe3 (CO)12, with octafluorocyclohexa-1,3- or 1,4-dienes forms a compound C6F8Fe(CO)3 which must be formulated as a pi-bonded olefin complex. In contrast, the interaction of tetrafluoroethylene with Fe3(CO)12 gives a compound C4F8Fe(CO)4 in which the iron atom is bound to carbon by sigma-bonds in a perfluorocycloalkane ring. Infrared, high-resolution nuclear magnetic resonance and mass spectroscopic studies support these formulations. Products from the interaction of C2F4 with Co2(CO)8 and (pi-C5H5)2Co and of the latter with CF3I are described. (Author)