Surface studies of complex molecular systems
Hans-Peter Steinrück
Physikalische Chemie, Universität Erlangen‐Nürnberg
17:15 - 18:15 Tuesday 22 November 2011 TUG P2 Chemical reactions on surfaces can be followed in detail using X-ray photoelectron spectros-copy (XPS or ESCA). From the binding energies of the adsorbate and substrate core levels, detailed information on the chemical composition, chemical state (e.g. oxidation state), adsorption sites, but also on the photoemission process itself can be derived. Based on the understanding obtained for simple adsorbate systems, now complex molecular systems can be studied in great detail. In this presentation two examples will be addressed. The first deals with the adsorption of metallo¬porphyrins on metal surfaces and their interaction with small molecules. In particular we focus on the synthesis of metalloporphyrin monolayers by direct metalation of porphyrin monolayers, the chemical interaction with the metal surface and attachment of axial ligands on the central metal ion of the metalloporphyrin. The second example is the characterization and modification of the surface properties of ionic liquids. Due to their low vapor pressure the full arsenal of UHV-based surface science methods can be applied to investigate this material class and detailed information can be derived.
J. M. Gottfried, K. Flechtner, A. Kretschmann, T. Lukasczyk, and H.-P. Steinrück, Direct synthesis of a metalloporphyrin complex on a surface, J. Am. Chem. Soc. 128 (2006) 5644-5645.
K. Flechtner, A. Kretschmann, L. R. Bradshaw, M.-M. Walz, F. Maier, H.-P. Steinrück and J. M. Gottfried, In-situ Two-Step Synthesis of the Complex (Ammine)(5,10,15,20-tetraphenylporphyrinato)-zinc(II) on a Ag(111) Surface, J. Phys. Chem. 111 (2007) 5821-5824.
T. E. Shubina, H. Marbach, K. Flechtner, A. Kretschmann, N. Jux, F. Buchner, H.-P. Steinrück, T. Clark, and J. M. Gottfried, Principle and Mechanism of Direct Porphyrin Metalation: A Joint Experimental and Theoretical Investigation, J. Am. Chem. Soc. 129 (2007) 9476-9483.
K. Flechtner, A. Kretschmann, H.-P. Steinrück, and J. M. Gottfried, NO-induced reversible switching of the electronic interaction between a Porphyrin-coordinated cobalt ion and a silver surface J. Am. Chem. Soc. 129 (2007) 12110-12111.
F. Buchner, I. Kellner, W. Hieringer, A. Görling, H.-P. Steinrück, H. Marbach, Ordering aspects and intramolecular conformation of tetraphenylporphyrins on Ag(111), Phys. Chem. Chem. Phys. 12 (2010) 13082-13290.
W. Hieringer, K. Flechtner, A. Kretschmann, K. Seufert, W. Auwärter, J.V. Barth, A. Görling, H.-P. Steinrück, J. M. Gottfried, The Surface Trans Effect: Influence of Axial Ligands on the Surface Chemical Bonds of Adsorbed Metalloporphyrins, J. Am. Chem. Soc. 133 (2011) 6206-6222.
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. 45 (2006) 7778-7780 and Angew. Chem. 118 (2006) 7942-7944.
H.-P. Steinrück, Surface Science goes liquid !, Surf. Sci. 604 (2010) 481-484 (Invited Prospective Article).
K. R. J. Lovelock, I. J. Villar-Garcia, F. Maier, H.-P. Steinrück, P. Licence, Photoelectron Spectroscopy of Ionic Liquid-Based Interfaces, Chem. Rev. 110 (2010) 5158-5190.
H.-P. Steinrück, J. Libuda, P. Wasserscheid, T. Cremer, C. Kolbeck, M. Laurin, F. Maier, M. Sobota, P. S. Schulz, M. Stark, Surface Science and Model Catalysis with Ionic Liquid-Modified Materials, Adv. Mater. (2011) 2571-5587.
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