– Ibrahim Elmehaina

Assistant Professor Dept. of Chemistry – Faculty of Science University of Khartoum P.O. Box 321 Postal code 11115 Khartoum – Sudan.

E-mail: ielmihaina@uofk.edu

-Yousif Sulfab

Professor of Chemistry Dept. of Chemistry – Faculty of Science – University of Khartoum P.O. Box 321 Postal code 11115 Khartoum – Sudan.

E-mail: ysulfab@uofk.edu

-Ahmed M. Elhassan,

Professor of Chemistry Dept. of Chemistry – Faculty of Science – University of Khartoum P.O. Box 321 Postal code 11115 Khartoum – Sudan.

E-mail: amelhassan@uofk.edu