COLL 10 |
| John N Russell Jr.1, Daniel E. Barlow1, James E. Butler1, Michael P. Schwartz2, Robert J. Hamers2, and Mark P. D'Evelyn3. (1) Chemistry Division, Naval Research Laboratory, Code 6125, 4555 Overlook Avenue SW, Washington, DC 20375-5342, (2) Department of Chemistry, University of Wisconsin - Madison, 1101 University Avenue, Madison, WI 53706, (3) GE Global Research, Schenectady, NY 12301 |
| Both diamond and silicon (100)-2x1 surfaces are comprised of dimers linked by a sigma bond and a highly-strained pi bond. However, there are notable differences in their structure and chemical reactivity. Using multiple internal reflection infrared spectroscopy and X-ray photoelectron spectroscopy, the reactivity of these surfaces to a series of alkenes was examined. Dialkenes, such as 1,3-butadiene, efficiently react with the diamond and silicon surface dimers via a [4+2] cycloaddition reaction. However, compounds containing only one double bond, such as cyclopentene, and propene react with the surface dimers via a [2+2] cycloaddition, a symmetry-forbidden reaction for alkenes, with a sticking coefficient of < 10-3. Conjugated heteroatomic molecules, such as cyclohexanedione and acrylonitrile, exhibit very different chemistries on the diamond and silicon (100)-2x1 surfaces. We examine the roles of ring strain, electron donating and withdrawing groups, and bifunctionality on adsorption probability and the structure of the chemisorbed species. |
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Vibrational Analyses of Dry and Wet Surfaces
9:00 AM-11:30 AM, Sunday, March 28, 2004 Marriott -- Grand Ballroom H, Oral
Division of Colloid and Surface Chemistry |