Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (09): 1043-1046.doi: 10.3866/PKU.WHXB20060901

• Communication •     Next Articles

Chemical Thermal Decomposition of 2-iodoethanol on Ni(100)

ZHAO Qing;ZHANG Hui-Min;ZAERA Francisco   

  1. Department of Physics, College of Science, Beijing Institute of Technology, Beijing 100088, P. R. China; Department of Chemistry, University of California, Riverside, California 92521, USA
  • Received:2006-04-05 Revised:2006-06-14 Published:2006-09-04
  • Contact: ZHAO Qing

Abstract: The temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) were used to study the adsorption and thermal decomposition of 2-iodoethanol on clean Ni(100). The results show that 2-iodoethanol adsorbs molecularly at 100 K in two ways, either just by iodine atom or by both iodine and hydroxyl ends of the molecule. A thermal decomposition starts around 140 K with the production of small amounts of ethylene and water. The bulk of the 2-iodoethanol decomposes at about 150 K via a carbon-iodine scission to form −O(H)CH2CH2− and 2-hydroxyethyl intermediates. Around 160 K the −O(H)CH2CH2− dehydrogenates to an oxametallacycle species (−OCH2CH2−). The two intermediates further decompose to acetaldehyde, at around 210 K and above 250 K, respectively, and some of the acetaldehyde desorbs while the rest decomposes to hydrogen and carbon monoxide.

Key words: 2-iodoethanol, TPD, Ni(100)