1. Department of Organic and Applied Chemistry; University of Łódź, Tamka 12, PL-91-403; Łódź Poland
2. Institute of Inorganic and Analytical Chemistry; Friedrich-Schiller-University Jena, Humboldtstrasse 8, 07743 Jena; Germany
3. Department of Chemistry; University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich; Switzerland