1. Chemistry Department, College of Sciences and Humanities, Prince Sattam Bin Abdulaziz University, P.O. 10 Box 83, Al-Kharij 11942, Saudi Arabia
2. Chemistry Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt
3. Institute of Organic Chemistry, Karlsruher Institut fur Technologie, 76131 Karlsruhe, Germany
4. Institute of Biological and Chemical Systems (IBCS-FMS), Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
5. Martin Nieger, Department of Chemistry, University of Helsinki, P.O. Box 55 (A. I. Virtasen aukio I), 00014 Helsinki, Finland