Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 79: Electronic structure II
O 79.1: Talk
Thursday, March 17, 2011, 15:00–15:15, WIL C107
Towards a molecular understanding of cation-anion interactions in ionic liquids — •Till Cremer1, Claudia Kolbeck1, Florian Maier1, Natalia Paape2, Peter Schulz2, René Wölfel2, Peter Wasserscheid2, Kevin Lovelock3, Jens Thar4, Henry Weber4, Barbara Kirchner4, and Hans-Peter Steinrück1 — 1Physikalische Chemie II, FAU Erlangen, D — 2Chemische Reaktionstechnik, FAU Erlangen, D — 3School of Chemistry, University of Nottingham, UK — 4Ostwald Institut, University of Leipzig, D
Ionic liquids (ILs), organic salts with melting points below 100∘C, are a new class of materials labelled ”designer solvents” for the exciting prospect of tailoring their physical properties by combining an appropriate choice of cation and anion. Regarding the enormous number of possible ion combinations, reliable prediction concepts based on the chemical nature of the IL compounds are needed. In order to estimate the deviation from a simplified superposition of individual anion- and cation-related properties, one has to understand the complex nature of interactions between IL ions, namely coulombic, hydrogen-bond-type and dispersive forces. In this combined XPS, NMR and DFT study1, interionic interactions in ten different imidazolium-based ILs are examined. In particular, first direct experimental and theoretical evidence for anion-cation charge transfer phenomena in ionic liquids is found. This work was supported by the DFG through SPP1191 ”Ionic Liquids” and the Cluster of Excellence ”Engineering of Advanced Materials”.
1 T. Cremer et al., Chem. Eur. J. 2010, 16, 9018