1. Technische Universität Chemnitz Faculty of Natural Sciences Institute of Chemistry, Inorganic Chemistry, D- 09107 Chemnitz Germany
2. Department of Chemistry University of Hamburg Martin Luther King Pl 6 20146 Hamburg Germany
3. Technische Universität Dresden Carl Gustav Carus Faculty of Medicine Department of Anesthesiology and Intensive Care Medicine Clinical Sensoring and Monitoring Fetscherstr. 74 D-01307 Dresden Germany