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Title: Penning ionization electron spectroscopy of group IVB trimethylphenyls: (CH3)3MC6H5 (M = C, Si, Ge, Sn, Pb)
Authors: Aoyama, M.
Masuda, S.
Ohno, K.
Harada, Y.
Mok, C.Y. 
Huang, H.H. 
Lee, S.Y. 
Issue Date: 1989
Source: Aoyama, M.,Masuda, S.,Ohno, K.,Harada, Y.,Mok, C.Y.,Huang, H.H.,Lee, S.Y. (1989). Penning ionization electron spectroscopy of group IVB trimethylphenyls: (CH3)3MC6H5 (M = C, Si, Ge, Sn, Pb). Journal of Physical Chemistry 93 (14) : 5414-5418. ScholarBank@NUS Repository.
Abstract: He*(23S) Penning ionization electron spectra (PIES) and He I photoelectron spectra (UPS) of group IVB trimethylphenyls (CH3)3CC6H5, (CH3)3SiC6H5, (CH3)3GeC6H5, (CH3)3SnC6H5, and (CH3)3PbC6H5 were measured to study the spatial electron distributions of individual molecular orbitals. The relative band intensities in PIES were analyzed on the basis of ab initio MO calculations, and all the UPS bands were assigned to molecular orbitals. Except for (CH3)3CC6H5, most bands in the PIES and UPS can be interpreted in terms of the superpositions of the corresponding spectra of metal tetramethyls and benzene, showing that interaction between the metal trimethyl and phenyl moieties is weak. The phenyl π orbitals give strong bands in PIES, because they are widely distributed outside the molecule and easily interact with metastables. With increasing size of the central atom, the relative intensity of the M ns band decreases in PIES, although the spatial expanse of the M ns atomic orbital increases. This indicates that the electron densities on the surrounding moieties, which diminish on going from (CH3)3CC6H5 to (CH3)3PbC6H5, contribute most to the band intensity as in the case of (CH3)4M. © 1989 American Chemical Society.
Source Title: Journal of Physical Chemistry
ISSN: 00223654
Appears in Collections:Staff Publications

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