π bond versus radical character of the diamond (1 0 0)-2 x 1 surface

The dimers on clean diamond (1 0 0)-2 x 1 are linked by a sigma bond and a highly strained pi bond. The weakness of the surface pi bond causes the reactivity of this surface to be intermediate between that of an alkene and a bi-radical. We illustrate this behavior by investigating two prototypical c...

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Bibliographic Details
Published in:Materials chemistry and physics 2001-11, Vol.72 (2), p.147-151
Main Authors: RUSSELL, John N, BUTLER, James E, WANG, George T, BENT, Stacey F, HOVIS, Jennifer S, HAMERS, Robert J, D'EVELYN, Mark P
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
Materials science
Physics
Specific materials
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Summary:The dimers on clean diamond (1 0 0)-2 x 1 are linked by a sigma bond and a highly strained pi bond. The weakness of the surface pi bond causes the reactivity of this surface to be intermediate between that of an alkene and a bi-radical. We illustrate this behavior by investigating two prototypical cycloaddition surface reactions using multiple-internal-reflection infrared spectroscopy. Adsorption of 1,3-butadiene occurs via [4 + 2] addition to surface dimers, analogous to Diels-Alder chemistry of alkenes. However, [2 + 2] cycloaddition of cyclopentene, a reaction that is symmetry-forbidden with alkenes, occurred with a sticking coefficient of [similar to]10 super(-3). These reactions illustrate novel approaches to the functionalization of diamond surfaces. copyright 2001 Elsevier Science B.V. All rights reserved.
ISSN:0254-0584
1879-3312
DOI:10.1016/S0254-0584(01)00425-4