Specific Intermolecular Interactions of Silanes and Their Derivatives

Abstract

Research on the electron structures of the hydrides of the silicon element subgroup by photoelectron spectroscopy showed that, in the case of their ions, the minimum energy is accounted for by the C_2υ configuration, similarly to CH₄ [1–3]. The ionization fields of silanes Si _n H_2n+2 with two to five silicon atoms is thought to divide into the ionization fields Si–Si and Si–H binding electrons [4, 5]. The increasing number of chain silicon atoms is accompanied by broadening of the ionization field of σ(SiSi) electrons, similar to the levels of s- and p-type in the alkane molecules, which reflects the similarity in their properties. However, the bandwidth responsible for the Si–H binding level varies little. With increasing chain length, the ionization field of σ(SiSi) electrons is broadens, similar to the levels of s- and p-type in the alkane molecules [2]. In the case of pentasilane, this field is spreads from 9 to 11.5 eV. For the compounds Si _n H_2n+2 where n = 4 and 5 in the field of ionization of Si–Si binding levels, it was discovered that the contributions corresponded to 2–4 rotamers [2, 3]. These compounds are characterized by the shifting of electron density from the hydrogen atoms to the essentially undivided 3s ² electron pair of the silicon atom and by the difference in the charges of the chain silicon atoms.