1. Faculty of Science, Chemistry Department, Fayoum University, Fayoum City, Egypt, Tel. ; Fax:
2. Chemistry Department, Al-quwaiyah College of Science and Humanities, Shaqra University, Al-quwaiyah, KSA
3. Faculty of Science, Chemistry Department, Sirte University, Sirte City, Libya
4. Faculty of Science, Chemistry Department, Ain–Shams University, Cairo, Egypt, Tel.