COLL 306 |
| Bruce E. Koel, Department of Chemistry and Materials Science, Department of Chemistry and Materials Science, University of Southern California, 920 W. 37th Street, Los Angeles, CA 90089-0482 |
| Chemistry and control of chemical bonding at Au interfaces is important in electrical contacts (Au) to organic molecular films, applications using SAMs on Au surfaces, supported Au nanoparticles, and Au-alloy heterogeneous catalysts. Nonetheless, little is known about the chemistry of covalently linked organic molecules at Au surfaces. Vibrational analyses using FT-IRAS has been important in identification of adsorbed species and reactive intermediates in our recent surface-science studies on Au single-crystal surfaces. For example, using EID to produce cyclohexyl and phenyl groups, we show that hydrogenation, dehydrogenation, and C-C coupling reactions of these intermediates on Au(111) are facile, low temperature processes. Thus, gold might play a more important, direct role in bimetallic catalysts than just blocking active sites. IRAS was used to observe nCO bands characteristic of CO bound at steps and terraces on Au surfaces. Using ozone, we have shown that oxygen adatoms on Au(111) and (211) are very reactive, oxidizing CO and other molecules at low temperatures. |
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Vibrational Analyses of Dry and Wet Surfaces
8:30 AM-11:30 AM, Tuesday, March 30, 2004 Marriott -- Grand Ballroom H, Oral
Division of Colloid and Surface Chemistry |