Crossref journal-article
AIP Publishing
The Journal of Chemical Physics (317)
Abstract

The mechanism and intermediates of a Diels–Alder-type cycloaddition reaction between dienes and the silicon dimers of a Si(100)-2×1 surface, which was theoretically predicted by Doren and Konecny, have been investigated. The reactions of 1,3-butadiene and 2,3-dimethyl-1,3-butadiene were studied using multiple internal reflection infrared spectroscopy, thermal desorption spectrometry, and near edge x-ray absorption fine structure (NEXAFS) measurements. The results show that the compounds physisorb on Si(100)-2×1 at cryogenic temperature. Infrared studies of the room temperature adsorption of both dienes indicate that reaction leads to the formation of stable, chemisorbed Diels–Alder adducts. By NEXAFS measurements on 2,3-dimethyl-1,3-butadiene, we determine that the angle between the π orbitals of the reaction product and the Si(100)-2×1 surface is near 40°. Upon heating, the chemisorbed butadienes primarily decompose to form adsorbed carbon and hydrogen at the surface. Hydrogenation of chemisorbed butadienes by atomic hydrogen was also investigated, and conversion from the Diels–Alder geometry to [2+2] bonding is observed. This effect is attributed to cleavage of the Si–Si dimer bond upon atomic hydrogen exposure. Temperature dependent studies suggest the presence of an activation barrier for chemisorption at low temperature. The parallels between our experimental results and the theoretical studies of these reactions are discussed.

Bibliography

Teplyakov, A. V., Kong, M. J., & Bent, S. F. (1998). Diels–Alder reactions of butadienes with the Si(100)-2×1 surface as a dienophile: Vibrational spectroscopy, thermal desorption and near edge x-ray absorption fine structure studies. The Journal of Chemical Physics, 108(11), 4599–4606.

Authors 3
  1. Andrew V. Teplyakov (first)
  2. Maynard J. Kong (additional)
  3. Stacey F. Bent (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 8:15 a.m.)
Deposited 1 year, 6 months ago (Feb. 6, 2024, 5:12 p.m.)
Indexed 3 months, 1 week ago (May 22, 2025, 4:46 a.m.)
Issued 27 years, 5 months ago (March 15, 1998)
Published 27 years, 5 months ago (March 15, 1998)
Published Print 27 years, 5 months ago (March 15, 1998)
Funders 0

None

@article{Teplyakov_1998, title={Diels–Alder reactions of butadienes with the Si(100)-2×1 surface as a dienophile: Vibrational spectroscopy, thermal desorption and near edge x-ray absorption fine structure studies}, volume={108}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.475870}, DOI={10.1063/1.475870}, number={11}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Teplyakov, Andrew V. and Kong, Maynard J. and Bent, Stacey F.}, year={1998}, month=mar, pages={4599–4606} }