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| Calendar: | ALS Calendar |
| Title: | ALS-CXRO Seminar | Prof. Georg Held (U Reading UK) |
| When: | 05/ 9/2012 3:00 PM - 4:00 PM |
| Description: | ALS-CXRO Seminar Series Wed, May 9, 2012 3-4 15-253 Host: Sung-Kwan Mo Presented by: Georg Held Department of Chemistry, University of Reading, UK Title: Chiral Adsorption Systems studied by Synchrotron Methods Abstract: The last decade has seen a dramatic increase in research into chiral surface systems, driven by the growing demand for optically pure chemicals in drug manufacturing and, hence, a desire for enantioselective heterogeneous catalysts. These avoid the problem of phase separation inherent in homogeneous enantioselective processes which are predominantly used today. So far, significant success has been achieved by modifying achiral surfaces with chiral molecules thus creating a stereo-selective reaction environment for α and β-ketoesters [1,2]. Alternatively, intrinsically chiral metal and mineral surfaces show enantioselective behavior without such modifiers [3,4], although these mechanisms are much less well understood. The talk will present examples of (AP-)XPS and NEXAFS studies of both types of chiral adsorption systems. Particular emphasis is on enantioselective adsorption of small chiral amino acids (e.g. alanine, serine on Cu{531} [6]) and the influence of solvents, such as water on amino acid modifiers (e.g. water/alanine on Cu{110} [7]). [1] A. Baiker, J. Mol. Catal. A 115 (1997) 473. [2] C. J. Baddeley, Top. Catal. 25 (2003) 17. [3] C.F. McFadden, P.S. Cremer, A.J. Gellman, Langmuir 12 (1996) 2483. [4] G. A. Attard, J. Phys. Chem. B 105 (2001) [5] G. Held, M. Gladys, Topics in Catalysis, 48 (2008) 128; [6] T. Eralp, A. Cornish, A. Shavorskiy, G. Held, Topics in Catalysis 54 (2011) 1414 [7] A. Shavorskiy, F. Aksoy, M. Grass, Z. Liu, H. Bluhm, and G. Held, JACS 133 (2011) 6659. |
| Location: | 15-253-CR(80) |
| Author: | Adriana Reza |
