1. Department of Chemistry, College of Science, University Salahaddin-Erbil, Iraq
2. Department of Biology, College of Education, Salahaddin-Erbil, Iraq
3. Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100 Pavia, Italy
4. C.I.St.R.E., Università di Pavia, Via Taramelli 12, 27100 Pavia, Italy