Differential reactivity and structure of mono- and dialkozides--the reactions of ethylene glycol on Mo(110)

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Bibliographic Information

Differential Reactivity and Structure of Mono- and Dialkoxides: The Reactions of Ethylene Glycol on Mo(110). Queeney, K. T.; Arumainayagam, C. R.; Weldon, M. K.; Friend, C. M.; Blumberg, M. Q. Departments of Chemistry, Harvard University, Cambridge, MA, USA. J. Am. Chem. Soc. (1996), 118(16), 3896-904. CODEN: JACSAT ISSN: 0002-7863. Journal written in English. CAN 125:10110 AN 1996:215102 CAPLUS (Copyright 2001 ACS)

Abstract

The reactions of ethylene glycol on Mo(110) were studied using temp.-programmed reaction, IR reflection absorption, and X-ray photoelectron spectroscopies. The major reaction pathway is double C-O bond scission to evolve gas-phase ethylene at 350 and 390 K. Both X-ray photoelectron and IR spectra demonstrate the existence of two surface intermediates, a bidentate (-OCH₂CH₂O-) and a monodentate (-OCH₂CH₂OH) species, at satn. coverage of ethylene glycol. We demonstrate that all ethylene glycol in the mixed overlayer of mono- and bidentate species reacts via a bidentate surface intermediate. Furthermore, in contrast to previous studies on other surfaces, the dialkoxide ethylene glycol intermediate is shown to be more reactive than similar monoalkoxides on Mo(110). Finally, anal. of the IR spectra demonstrates that the bidentate species adsorbs with C₂ (or lower) symmetry at 300 K.