1. Chemistry Department, Faculty of Science; Minia University; El-Minia 61519 Egypt
2. Chemistry and Environmental Division; Manchester Metropolitan University; Manchester M1 5GD England
3. Department of Medicinal Chemistry, Faculty of Pharmacy; Minia University; 61519 El-Minia Egypt
4. Department of Chemistry; Tulane University; New Orleans LA 70118 USA
5. Department of Physics, Faculty of Sciences; Erciyes University; 38039 Kayseri Turkey
6. Institute of Organic Chemistry; Karlsruhe Institute of Technology; Fritz-Haber-Weg 6 76131 Karlsruhe Germany
7. Laboratory of Inorganic Chemistry, Department of Chemistry; University of Helsinki; P.O Box 55 (A. I. Virtasen aukio 1) 00014 Helsinki Finland