Transition-metal complexes with σ-bonded fluorine-containing groups: VII. Intramolecular cis-trans isomerization of bis-(perfluoroalkyl)iron tetracarbonyls☆

Abstract cis -(C n F 2 n+1 )Fe(CO) 4 ( n = 2, 3, 4 and 6) complexes were studied via IR spectroscopy in the region of the v (CO) bands. Stereochemical non-rigidity of these complexes in perfluorodecalin was found above 80–100°C. On the basis of the obtained kinetic and activation parameters of cis-trans isomerization, a conclusion was made about the intramolecular nature of the rearrangement process.