Adsorption and chemical reaction of Cu(hfac)(vtms) on Cu(1 1 1)

We have investigated the adsorption and reaction of Cu(hfac) (vtms) (hexafluoroacetylacetonate, hfac; vinyl trimethyl silane, vtms) on a Cu(1 1 1) surface. The recombinative desorption of Cu(hfac)(vtms) and disproportionation reaction between adsorbed Cu(hfac) molecules were observed to occur between 240 and 400 K. The adsorption geometries of Cu(hfac) on Cu(1 1 1) have been also calculated by means of the extended Hückel method. It is found that the standing Cu(hfac) is more stable and favored for a cleavage of Cu–O bonds than the lying-down Cu(hfac) on the Cu(1 1 1) surface.