UV/Vis-Spectroscopic Investigations of Cyclosilanes

Article abstract of DOI:10.1007/BF00810097

UV/Vis-spectra of Cyclosilanes (SiX2)n with X = Cl, Br, I, OMe and n = 4, 5, 6 are recorded and interpreted qualitatively.The spectra exhibit increasing influence of the substituents on the Si-Si-bond system within the rings in the order Cl <*> OMe -> Br -> I.At the low energy side of the spectra weak absorption bands, possibly due to intramolecular charge transfer transitions, appear.The strong inductive effect of the electronegative substituents is documented by a marked increase of the first IP's compared to permethylcyclosilanes. - Keywords: Cyclopolysilanes; UV/vis-spectra