摘要
[PPN]_2[Ru_3(CO)_9(CCO)]负载于SiO_2-Al_2O_3表面后其红外光谱显示了2124,2088,2060,2040和2010cm(-1)几个谱带,认为这是由于[Ru_3(CO)_9(CCO)]^(2-)同SiO_2-Al_2O_3的Si(OH)Al基团(3620 cm^(-1))反应生成了H_2Ru_3(CO)_9(CCO)
Infrared spectra of [PPN]2[Ru3(CO)9(CCO)] supported on SiO2-Al2O3 exhibited several bands at 2124,2088,2060,2040 and 2010cm-1,which are in good agreement with the characteristic frequencies of H2Ru3(CO)9-(CCO) in CH2Cl2. These results suggest that there is H2Ru3(CO)9(CCO) species on the surface of SiO2-Al2O3. The pyridine adsorption on the surface of SiO2-Al2O3 and the SiO2-Al2O3 supported [Ru3(CO)9(CCO)]2-were compared. In contrast to SiO2-Al2O3 support, after the impregnation of [Ru3(CO)9(CCO)]2- on SiO2-Al2O3, the intensity of 1540cm-1 band assigned to Bronsted acid site was greatly reduced, but the intensity of 1448cm-1 band assigned to Lewis acid site remained. From the above results, it is suggested that the surface reaction is due to the reactivity of strong acidic OH group (Si(OH)Al) of SiO2-Al2O3 with dianion triruthenium ketenylidene cluster [Ru3(CO)9(CCO)]2-, resulting in neutral triruthenium ketenylidene cluster H2Ru3(CO)9(CCO).
