The compound [Fe(CO)4(PMe3) could adopt a trigonal bipyramidal geometry with the phosphine in either an axial or an equatorial position.
(a) Indicate the point group of the molecule
(b) Write a reducible representation for the set of vectors that represent the CO stretching vibrations
(c) Use the reduction formula to determine which irreducible representations of the point group describe the C-O stretching vibration modes
(d) Indicate which of the CO stretching modes would be active in the IR and Raman spectrum