Abstract
The photoelectron spectra of some five-co-ordinate trigonal-bipyramidal complexes [Fe(CO)4L](L = PMe3, PPh3, AsPh3, or pyridine in an axial position, or CH2CH–CN and CH2CH–CHO in the equatorial plane) have been measured. The spectra have been assigned by comparing them with one another and with those available for [Fe(CO)5] and [Fe(CO)4(η-C2H4)]. CNDO calculations carried out for [Fe(CO)4(py)] and [Fe(CO)4(η2-CH2CH–CN)] are of only limited help in making assignments. The substituent effect on the stability of the Fe-L bond is discussed. The stability order obtained is the same as that found previously via kinetic studies.
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