1. Imam Mohammad Ibn Saud Islamic University (IMSIU) College of Science, Chemistry Department P.O. Box 90905 Riyadh 11623 KSA
2. Industrial research and consultancy center (IRCC) Khartoum North Sudan
3. Sudan University of Science and Technology (SUST) College of Science, Chemistry Department P.O. Box 407 Khartoum Sudan
4. Imam Mohammad Ibn Saud Islamic University (IMSIU) College of Science, Biology Department Riyadh Saudi Arabia
5. Department of Chemistry, Faculty of Education-Zabid Hodeidah University Hodeidah Yemen