1. Institut für Anorganische und Analytische Chemie, Friedrich‐Schiller‐Universität Jena, August‐Bebel‐Straße 2, 07743 Jena, Germany, Fax: +49‐3641‐948102
2. Chemistry Department, Jordan University of Science and Technology, 22110 Irbid, Jordan
3. University of Lodz, Department of Organic and Applied Chemistry, Tamka 12, 91‐403 Łódź, Poland