Abstract
Gas-phase UV photoelectron spectra and pseudopotential calculations were used to elucidate the electronic structure of a series of alkyl lead acetylides, a trimethylsilyl-trimethylplumbyl-acetylide and bis(trimethylsilyl)butadiyne. The analysis of the results obtained, along with the comparison with previous data on tin analogues, confirmed the presence of a σ/π conjugation between the πC≡C and the σ orbitals of the metal-alkyl moieties. The ionization of the 5d pseudo-valence orbitals of Pb was observed and compared with the calculated net atomic charge on Pb. A spin-orbit effect was found in the ionization of valence MO's with significant contribution of 6p Pb orbitals.
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