| AVS 62nd International Symposium & Exhibition | |
| Surface Science | Monday Sessions |
| Session SS-MoA |
| Session: | Organics and Ionic Liquids: Surfaces, Layers, Interfaces and Chirality |
| Presenter: | Hans-Peter Steinrück, Universität Erlangen-Nürnberg, Germany |
| Correspondent: | Click to Email |
Ionic liquids (ILs), salts with melting points below 100 °C, represent a fascinating class of liquid materials, typically characterized by an extremely low vapour pressure. Besides their application as new solvents or as electrolytes for electrochemical purposes, ILs are also used in catalysis. Two important concepts in this context are Supported Ionic Liquid Phase (SILP) and Solid Catalyst with Ionic Liquid Layer (SCILL). In both, a high surface area solid substrate is covered with a thin IL film, which contains either a homogeneously dissolved transition metal complex for SILP, or which modifies catalytically active surface sites at the support for SCILL. Thereby, the interfaces of the IL with the gas phase and with catalytic nanoparticles and/or support materials are of critical importance. It has recently been demonstrated that these interfaces and also the bulk of ILs can be investigated in great detail using surface science studies in an ultrahigh vacuum environment. From angle-resolved X-ray photoelectron spectroscopy, detailed information on the surface and bulk composition of non-functionalized and functionalized ILs, on segregation and enrichment effects, on the dissolution and reactivity of catalytically active metal complexes in ILs, on the growth of ultrathin IL-layers, and even on liquid phase reactions studied in situ in the IL, can be derived. Various examples will be discussed.
H.-P. Steinrück and P. Wasserscheid, Ionic Liquids in Catalysis, Catal. Lett. 2015, 145, 380.
H.-P. Steinrück, Recent developments in the study of ionic liquid interfaces using X-ray photoelectron spectroscopy and potential future directions, Phys. Chem. Chem. Phys. 2012, 14, 2510.
H.-P. Steinrück, Surface Science goes liquid !, Surf. Sci. 2010, 604, 481.
F. Maier, J. M. Gottfried, J. Rossa, D. Gerhard, P. S. Schulz, W. Schwieger, P. Wasserscheid, H.-P. Steinrück, Surface enrichment and depletion effects of ions dissolved in an ionic liquid. An X-ray photoelectron spectroscopy study, Angew. Chem. Int. Ed. 2006, 45, 7778.