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Genève, Switzerland

Hu X.,CAS Yantai Institute of Coastal Zone Research | Hu X.,University of Heidelberg | Burgi T.,Quai Ernest Ansermet | Burgi T.,University of Heidelberg
Applied Catalysis A: General | Year: 2012

TiO2 coated Au nanoparticles were synthesized and characterized by TEM, XPS and XRD. It was found that the Au nanoparticles were coated with TiO2 thus forming a core-shell structure. Electron transfer, adsorption and photodegradation of malonic acid on the catalyst were investigated by in situ attenuated total reflection infrared (ATR-IR) spectroscopy. Malonic acid adsorbed and underwent photodegradation efficiently in air and nitrogen atmosphere under UV light illumination on the prepared catalyst. As intermediate species oxalate was observed on the catalyst surface during the photodegradation of malonic acid. The Au nanoparticles accelerate the degradation of malonic acid by capturing the conduction band electrons of TiO2. The ATR spectra also reveal interface electron transfer from Au nanoparticles to TiO2 under visible light illumination and from TiO2 to Au nanoparticles under UV illumination. © 2012 Elsevier B.V.

Guin J.,Quai Ernest Ansermet | Besnard C.,University of Geneva | Pattison P.,Ecole Polytechnique Federale de Lausanne | Pattison P.,European Synchrotron Radiation Facility | Lacour J.,Quai Ernest Ansermet
Chemical Science | Year: 2011

Unsymmetrical cationic [4]helicenes react with hydride or organolithium reagents and the two diastereotopic faces can be discriminated with high efficiency. © The Royal Society of Chemistry 2011.

Michon C.,Quai Ernest Ansermet | Sharma A.,Quai Ernest Ansermet | Bernardinelli G.,University of Geneva | Francotte E.,Novartis | Lacour J.,Quai Ernest Ansermet
Chemical Communications | Year: 2010

New functionalized ethano-bridged Tröger bases are readily prepared using a simple alkylation/rearrangement sequence which affords configurationally stable derivatives as single stereoisomers (de > 96%). © 2010 The Royal Society of Chemistry.

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