Abstract
Assignments of a certain number of vibrational bands of (CO)Fe(PF 3) 4 are made with reference to the C 3v and C 2v isomers. A study of the Raman and ir spectra at low temperature revealed that in the solid state only one isomer exists. Furthermore, a comparative study of liquid (CO)Fe(PF 3) 4 and HCo(PF 3) 4 of molecular symmetry C 3v was made. These two approaches made it possible to determine the difference in enthalpy between the two isomers of the iron complex (+0-52±0.05 kcal.mole −1) in the liquid state, as well as to verify the assignments proposed previously. The greater stability of the C 2v isomer is discussed.
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