Ab initio Calculations show that the first transition in the visible spectra of silanediyls(silylenes), RsiR′, is due to an n(Si)→ 3p(Si) excitation and that this absorption is shifted to shorter wavelengths by π-donors and to longer wavelengths by bulky substituents; the calculations for Me2Si are more consistent with a λmax. of 450 nm than with 350 nm.
Y. Apeloig and M. Karni, J. Chem. Soc., Chem. Commun., 1985, 1048 DOI: 10.1039/C39850001048
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