1. a Chemistry Department, Faculty of Applied Science, Taiz University, Taiz, Yemen, Chemistry Department, Faculty of Science, Assiut University, Asyut, Egypt;, Email: sm_ahmed@yahoo.com
2. b Chemistry Department, Faculty of Applied Science, Taiz University, Taiz, Yemen
3. c Chemistry Department, Faculty of Applied Science, Taiz University, Taiz, Yemen, Chemistry Department, Faculty of Science, Al-Azhar University, Cairo, Egypt