1. Basic Science Department, Preparatory Year, University of Ha’il, Hail , Saudi Arabia
2. Chemistry Department, Faculty of Science, Al-Azhar University, Cairo, Egypt
3. Petroleum Applications Department, Egyptian Petroleum Research Institute, Cairo, Egypt
4. Chemistry Department, Faculty of Science, Umm Al-Qura University, Makkah, Saudi Arabia
5. Department of Chemistry, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia