1. Medical Physicochemical Centre, Donetsk Medical University, 16 Ilych Avenue, Donetsk 83003, Ukraine, Max Planck Institute of Colloids and Interfaces, D-14424 Potsdam/Golm, Germany, and Faculty of Chemistry (AC1), University of Bielefeld, P.O. Box 100 131, D-33501 Bielefeld, Germany