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The bonding of fluorinated and hydrogenated diethers to Ru(001)

1989; Elsevier BV; Volume: 224; Issue: 1-3 Linguagem: Inglês

10.1016/0039-6028(89)90924-2

1879-2758

Mary M. Walczak, P. A. Thiel,

Inorganic Fluorides and Related Compounds

We describe thermal desorption studies of both fluorinated and hydrogenated diethers on the Ru(001) surface. We find that 1,1′-[methylenebis(oxy)]bisethane (CH3CH2OCH2OCH2CH3) chemisorbs on Ru(001) with a bond strength of 53–69 kJmol. About 0.05 monolayer decomposes. For comparison, 0.04 monolayer of 1,2-diethoxyethane (CH3CH2OCH2CH2OCH2CH3) decomposes. The chemisorbed diethoxyethane molecules desorb in three states. The desorption energy of the majority state is 58–62 kJmol. 1,2-Perfluorodiethoxyethane (CF3CF2OCF2CF 2OCF2CF3) bonds less strongly (44–47 kJmol) to Ru(001) than its hydrogenated analog, diethoxyethane. No perfluorodiethoxyethane decomposes. The diethers bond between 12% and 35% more strongly than the monoether analogs.