1. Institut für Anorganische und Analytische Chemie, Friedrich‐Schiller‐Universität, Humboldtstraße 8, 07743 Jena, Germany, Fax: +49‐3641‐948102
2. Current address: Department of Chemistry, MassachusettsInstitute of Technology, Cambridge, MA 02139, USA
3. Laboratory of Organic and Macromolecular Chemistry (IOMC) and Jena Center for Soft Matter (JCSM), Friedrich‐Schiller‐Universität Jena, Humboldtstr. 10, 07743 Jena, Germany
4. Faculty of Science and Arts at Alkamil, King Abdul Aziz University, P. O. Box 110, Alkamil 21931, Kingdom of Saudi Arabia
5. Permanent address: Chemistry Department, Jordan University of Science and Technology, P. O. Box 3030, Irbid 22110, Jordan
6. University of Lodz, Department of Organic and Applied Chemistry, Tamka 12, 91‐403 Lodz, Poland