HEI PHOTOELECTRON SPECTROSCOPIC (PES) STUDIES OF THE ELECTRONIC-STRUCTURE FOR SI(CH3)(N)CL-4-N (N=1,2,3) COMPOUNDS

HeI photoelectron spectroscopic (PES) studies of the electronic struct ure for the compounds Si(CH3)Cl-3, Si(CH3)(2)Cl-2 and Si(CH3)(3)Cl are given in this paper. The assignment of HeI photoelectron spectra has been done with the aid of band shapes and intensity, and by MNDO molec ular orbital calculations on each molecule studied. The HOMO of these molecules have the character of a sigma bond and spread over the whole molecule. The gradual decrease of the lowest ionization potential (IF ) associated with increasing numbers of methyl groups in the molecules studied should be ascribed to the electron-donating effect of the met hyl group. Both PES experimental and MNDO calculated results indicate no (p --> d)(pi) bonding for the molecules studied.