Hydride surface carbonyl species

The interaction of Ru3(CO)i2 with Si02 seems to proceed via a hydride surface carbonyl species. An ulterior decomposition under vacuum mainly gives Ru particles of 1.4nm and Ru(II) carbonyl species ]90]. Similarly, [HRu3(CO)io( t-OSi)]surface specics are generated by the reachon of Ru3(CO)i2 with a porous Vycor glass at 65 °C under air ]103]. Above 130 °C it was reported that the surface cluster breaks down with formation of ]Ru(CO) (OSi)2]surface species (n = 2 and/or 3). When the initial surface species was heated in air at T> 250°C, decomposition of the cluster and formation of RUO2 nanoparticles were observed. 

Adsorbed species may be treated as surface compounds analogous to molecular compounds. For example, H may be called surface hydride, =C=0 may be called a linear surface carbonyl and... 

A patent (230) to Atlantic Richfield Co. claims that hydride platinum group metal carbonyl complexes such as ClRh(PPh3)3 supported on zeolites, for example, NaY, are suitable catalysts for the hydroformylation of low molecular weight olefins. However, since the bulky metal complex cannot diffuse into the inner pores of the zeolite it must simply be adsorbed on the external surface of the support. This is consistent with the rather poor catalyst stability which was attributed to leaching of the active species from the support. 

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