1. Department of Chemistry; Rajshahi University; 6205 Rajshahi Bangladesh
2. Department of Chemistry; North Dakota State University; 5516 Fargo ND 58105- USA
3. Department of Chemistry; Jadavpur University; 700032 Kolkata India
4. Department of Chemistry; University of Lagos; Akoba-Yaba Lagos Nigeria
5. Department of Chemistry; Queen's University; K7L 3N6 Kingston ON Canada