Photoelectron spectra and electronic structure of symmetrically trans-substituted disilylethylenes

✍ Scribed by W. Ensslin; H.-H. Schmidtke; Th. Kühn

• Book ID: 104139132
• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 560 KB
• Volume: 24
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)93866-0

✦ Synopsis

Dedicated to Professor Dr. L. Birkofer on the occasion of his 65th birthday The photoelectron spectra of trans-bisfirimethylsilyl)ethylene, trans-bis(trimethylsilyl)dichloroethylene and trans-bis(trimethylsilyl)dibromoethylene have been measured. The vertical ionization energies are assigned lo valence orbital energies obtained from semiempirical methods using Koopmans' theorem. Among these methods the symmetry adapted group orbital procedure proves to be most useful. Accordingly, d orbital participation may be neglected. Satisfactory assignments To o, II and lone pair ionizations are obtained by comparing band structures and band shifts in the spectra of homologous compounds. In particular the symmetry of the two lowest levels of the molecular cations has been definitely determined which was known until now only tentatively.