He I and He II photoelectron spectra of open-chain pentadienyl complexes of manganese and rhenium

Abstract

The He I and He II photoelectron spectra of some open-chain pentadienyl complexes of manganese and of rhenium, [M(η⁵-C₅H₇)(CO)₃](M = Mn or Re), [Mn(η⁵-C₅H₆Me)(CO)₃], [Mn(η⁵-C₅H₇)(CO)_2^–{P(OMe)₃}], and [Mn(η³-C₅H₇)(CO)₃(PMe₃)] are reported. The spectra are assigned by comparison of the ionization energies with those of similar complexes and from intensity patterns, and are related to a qualitative molecular-orbital scheme. The bonding of η⁵-C₅H₇ is compared with that of η⁵-C₅H₅.