FT-IR study of surface species derived from ([η-C 5H 5)Ru(CO) 2] 2 on oxide supports

Abstract

Surface reactions of [(η-C 5H 5)Ru(CO) 2] 2 adsorbed on partly dehydroxylated alumina and silica surfaces at room temperature and thermal stability of surface species in the temperature range of 303723 K have been followed by FT-IR spectroscopy. Model reactions of [(η-C 5H 5)Ru(CO) 2] 2 and, for comparison, those of [(η-C 5H 5)Fe(CO) 2] 2 in liquid xenon solutions have also been performed. As main surface species 1:1 and 1:2 hydrogen bonded complexes, 1:1 and 1:2 adducts with surface Lewis acid sites, (η-C 5H 5)(CO) 2RuH +Ru(CO) 2(η-C 5H 5) protonated molecules, [(η-C 5H 5)(CO) 2RuO], Ru (0,11)(CO) 2 (on alumina, only) monomeric surface anchored species were detected. The possibility of the existence of the (η-C 5H 5)(CO) 2RuH +-Ru(CO) 2(η-C 5H 5) molecule stabilized on the surface by coordination to surface O − has been discussed on the base of results gained from model measurements in liquid xenon solutions.