[Zurück]

V. Truttmann, N. Barrabés-Rabanal, T. Bürgi, G. Rupprechter:
"Ligand Exchange Reaction Studies on Supported Au Nanoclusters";
Poster: ISMPC17: International Symposium on Monolayer Protected Clusters, Monte Verita; 13.08.2017 - 16.08.2017; in: "ISMPC17: International Symposium on Monolayer Protected Clusters - Book of Abstracts", (2017).

Monolayer protected Au nanoclusters exhibit size dependant physical-chemical properties, which are also strongly related to the nature of the protecting ligand. Moreover, new properties can be applied by ligand exchange reactions. In previous work, reactivity and mechanism studies between monometallic and bimetallic Au25(SC2H4Ph)18 and bidentate thiol ligands were conducted using different analytical techniques, including spectroscopic ones [1,2].
Our aim is to go one step further and perform the ligand exchange reactions once the clusters are immobilized on a surface. Within this process, we expect to understand the interaction between cluster and support material. Moreover, it will allow functionalization of the immobilized clusters, thus creating a truly homogenous surface with defined properties. Currently, we have been able to perform the first ligand exchange reaction between a P-ligand protected Au cluster (Au11(PPh3)7Cl3) immobilized on an Al2O3 surface and monodentate S-ligands. It was followed by Polarization-Modulation Infrared Reflection-Absorption Spectroscopy (PM-IRRAS) for the first time.
As the interactions between cluster and substrate are believed to have significant impact on the reaction product, a ligand exchange reaction under similar conditions was performed in solution. Comparison of both processes and the obtained products allow us to better understand the interactions between the cluster and its support material.

References
[1] A. Sels, N. Barrabés, S. Knoppe and T. Bürgi, Nanoscale 2016, 8, 11130 - 11135.
[2] A. Sels, G. Salassa, S. Pollitt, C. Guglieri, G. Rupprechter, N. Barrabés and T. Bürgi, J. Phys. Chem. C 2017, in press.

http://publik.tuwien.ac.at/files/publik_267193.pdf