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Ein Dank an alle die mich in Leipzig unterstützt haben,
und an alle, die meine Vorlesungen "ertragen" haben! |
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Eine sehr schöne Zeit in Leipzig geht zu Ende: nach 1 1/2 Jahren werde ich zum 31.5.2009 Leipzig verlassen und an die TU Darmstadt zurück kehren.
Allen Kollegen, Doktoranden und Studenten möchte ich ganz herzlich für wunderbare Momente und viele unvergessliche Tage danken.
Allen neu gewonnenen Freunden einen herzlichen Dank für die herrliche Zeit hier in Leipzig!
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Title graphics: Reactive quinodimethane intermediates play a crucial role during the Gilch polymerization, leading to poly(para-phenylene-vinylene) (PPV) polymers.
As electrically conducting polymers, which also show electroluminescence properties, PPV are major components in organic light emitting devices (OLEDs) of the next generation.
The graphics show the singlet ground state (left: HOMO and center: LUMO) as well as excited triplet state (right: spin density contours) of α-bromo-2,5-dimethoxy-quniodimethane.
Extensive studies and DFT calculations will shed a light on the role of these intermediates during the polymerizations proceses.
For further details see: Toward Controlled Gilch Synthesis of Poly(p-phenylene vinylenes): Anionic vs Radical Chain Propagation, a Mechanistic Reinvestigation.
T. Schwalm, J. Wiesecke, S. Immel, and M. Rehahn, Macromolecules 2007, 40, 8842-8854.
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Title graphics: The double-bridged hemicarcerand was synthesized, which features nitrogen and oxygen donor atoms located on the interior of the spherical cavity and thus allows endohedral coordination of metal ions.
The Cu-II complex was studied in detail by electron paramagnetic resonance (EPR) spectroscopy and density functial theory (DFT) calculations,
with excellent agreement of proton-copper distances derived from both methods.
For further details see: Electron Paramagnetic Resonance Structure Investigation of Copper Complexation in a Hemicarcerand.
A. Gembus, B. Corzilius, R.-A. Eichel, K.-P. Dinse, S. Immel, D. Stumm, M. Flauaus, and H. Plenio, J. Phys. Chem. B 2006, 110, 15012-15020.
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Title graphics: Calculated structure of the β-cyclodextrin derived heptakis(2,3-dideoxy-2,3-epithio)-β-cycloallin (left: ball-and-stick model; center: CPK-type model; right: transparent surface model),
indicating the seven sulfur atoms pointing inside of the central cavity and towards the symmetry axis of the molecule.
For further details see: The First Synthesis of a Cycloallin Derivative from β-Cyclodextrin: Heptakis(2,3-dideoxy-2,3-epithio)-β-cycloallin.
M. Fukudome, T. Shiratani, Y. Nogami, D.-Q. Yuan, K. Fujita, and S. Immel, Angew. Chem. 2005, 117, 4273-4276; Angew. Chem. Int. Ed. Engl. 2005,44, 4201-4204.
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