Abstract
Gas-phase UV photoelectron spectroscopy (UPS) and pseudopotential ab initio calculations were used to analyse the electronic structure of (CH 3) 3PbCCCH 3, with particular interest in the possible σ-π interaction between the π(CC) system and the σ(PbC) bonds. The results obtained, compared with the UPS data already known for the tin analogue, and with the pseudopotential calculations performed during the present work for both compounds, showed that the bonding is similar in the two molecules. In particular the σ-π interaction is quite weak and the HOMO has mainly π(CC) character. The present interpretation is supported by the analysis of the NMR results.
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