G. Wu, D. Stacchiola, and M. Kaltchev
Aug 9, 2000
Citations
0
Influential Citations
14
Citations
Journal
Journal of the American Chemical Society
Abstract
The reaction products formed from 1,1-diiodoethane adsorbed on clean Ag(111) have been investigated by using reflection absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD) and compared to cis- and trans-2-butene adsorbed on the same Ag(111) surface. Ethylidene species synthesized from 1,1-diiodoethane adsorbed on Ag(111) dimerize to form 2-butenes. The TPD profiles of the reactively formed 2-butenes resemble those of cis- and trans-2-butenes directly adsorbed on Ag(111) exhibiting a sharp peak at ∼140 K and a broad feature at ∼184 K. The surface infrared spectra of cis- and trans-2-butene are distinguishable where monolayer cis-2-butene/Ag(111) exhibits peaks at 1445, 1434, and 1030 cm-1 whereas the trans isomer has features at 1429, 973, and 959 cm-1. It is found that the surface infrared spectrum collected after 1,1-diiodoethane adsorption on Ag(111) is very close to that of trans-2-butene on Ag(111). This demonstrates that the stereoselectivity of ethylidene dimerizatio...