Infrared Studies of the Interaction of Methanol with Cu_n, Ag_n, and Au_n

Abstract

Methanol (Me) adsorbs intact on copper, silver, and gold clusters at 70 K to form the complexes Cu n Me m , Ag n Me m , and Au n Me m , respectively. The infrared photodissociation spectra of the deuterium-substituted complexes M n (CD 3 OH) m and M n (CD 3 OD) m (M n ) Cu 3-11 , Ag 3-22 , and Au 3-13 ) have been recorded in the 9-11 µm region. The methanol C-O stretching band frequency is invariant with cluster size and depends only slightly on the metal of which the underlying cluster is composed, indicating that local interactions are responsible for the shift from the gas-phase value and that these interactions are similar for methanol adsorbed on clusters of all three metals. Progressive blue shifts of the depletion bands of Ag n Me m and Au n Me m with increasing m indicate a strong interaction among methanol ligands in these species.

Computer Simulation of Solution/Electrode Interfaces

“…Yet, the repulsive contributions of the CH 2 and CH 3 sites are felt at greater distances from the Au atoms than the one of the H site, due to their bigger size. These behaviours are in accordance with the insights provided by ab initio, DFT and experimental studies [9][10][11][12]. …”

Clusters: A bridge across the disciplines of physics and chemistry

“…A few include investigations of cluster reactions (201-204) on gas-phase oxide clusters and extensive work on pure metal clusters (205)(206)(207)(208)(209). For example, it has been shown (210) that reactions of Mo x O y ϩ with methanol display close similarities with the reactions of methanol over heterogeneous and homogeneous catalysts containing molybdenum-oxygen sites (211).…”

A force field for simulating ethanol adsorption on Au(111) surfaces. A DFT study

“…Studies of the interaction of methanol [13][14][15] and ethanol [16] with gold clusters showed that these molecules adsorb on the clusters through the O atom, similarly to water. All the calculations were performed using the Gaussian 98 software package [17].…”

“…Experimental and theoretical works on the adsorption of methanol, and more recently of ethanol, on gold clusters [13][14][15] showed that methanol and ethanol adsorb intact on gold clusters. Furthermore, the binding occurs through the O atom of the hydroxyl group and always with the less coordinated available Au atom of the cluster.…”