Ru3(CO)12 and Mo(CO)6 adsorbed on Ru(001) and Au/Ru: An infrared reflection-absorption study.

摘要

We obtained IRAS and TDS data for Ru(sub 3)(CO)(sub 12)/Ru(001) and Mo(CO)(sub 6)/Au/Ru systems for metal carbonyl coverages between submonolayer and approximately 20 monolayers. We characterized the C-O stretching mode of both systems (4 cm(sup (minus)1) FWHM) and a deformation mode of Mo(CO)(sub 6) at 608 cm(sup (minus)1) (1 cm(sup (minus)1) FWHM). Both IRAS and TDS data suggest adsorption and desorption of metal carbonyls as molecular species with a preferential orientation in the overlayers. The IR intensity of the C-O stretch per a C-O bond projected onto the surface normal is approximately twice (five times) larger for Ru(sub 3)(CO)(sub 12) (Mo(CO)(sub 6)) at submonolayer coverages than for CO/Ru(001) at (theta)(sub CO)=0.68. 31 refs., 4 figs.