CH3I and C2H5I on Au(100): adsorption and reaction

Surface chemistry of catalysis by gold

“…For C2-C4 iodoalkanes both disproportionation and coupling reactions were possible and occurred in the same temperature range, although their reaction channels were not competitive. Iodoethane was shown to produce C2H4, C2H6 and C4H10 between 260-270 K on both Au(111) (149) and Au(100) (150). However, the yield of ethene and ethane was observed to saturate at a rather low coverage of C2H5I whereas the yield of butane continued to increase until the monolayer was saturated.…”

“…They also observed that the methyl coupling reaction could be blocked by adsorption of trimethylphosphine (TMP). Heating the surface covered with CH3I and TMP, allowed for the observation of methyl radical desorption at 415 K. Bent's group found that higher iodoalkanes were even more reactive than iodomethane on gold single crystals (149,150). For C2-C4 iodoalkanes both disproportionation and coupling reactions were possible and occurred in the same temperature range, although their reaction channels were not competitive.…”

Density Functional Theory Study of Methyl Iodide Adsorption and Dissociation on Clean and K-Promoted β-Mo2C Surfaces

“…Having a large dipole moment, the adsorption and surface rearrangement of The Journal of Physical Chemistry C ARTICLE molecular CH 3 I is expected to be followed easily by WF measurements. 45 In Figure 4 the work function changes of the above surfaces are plotted as a function of CH 3 I exposure performed at 100 K. On both surfaces, a nearly linear change in WF was found up to ∼4 L exposure. It was observed previously 15 that 0.35 ML K promoted the decomposition of CH 3 I at 115 K only about to 5% following 4 L exposure.…”

Adsorption and decomposition of nickelocene on Ag(100): a high-resolution electron energy loss spectroscopy and temperature programmed desorption study

“…Peak A of the thermal desorption data was analyzed using the zero order, leading-edge method [35] in which the natural log of the desorption rate is plotted versus the inverse of the temperature. Multiplying the slope of the least-squares linear fi t by −R yielded a desorption energy of 21 ± 2 kcal mol −1 for multilayer nickelocene.…”