1. Department of Chemistry, Faculty of Science, Tishreen University, Latakia, Syrian Arab Republic
2. Faculty of Science and Arts, Mohail Asser, King Khalid University, Saudi Arabia
3. Department of Chemistry, King Saud University, P.O.Box 11495, Riyadh, Kingdom of Saudi Arabia
4. Department of Chemistry, St Berchmans College (Autonomous), Mahatma Gandhi University, Changanassery, Kerala-686101, India