1. Centre for Education
and Research on Macromolecules (CERM), CESAM Research Unit, Department
of Chemistry, University of Liege, Allée de la Chimie B6A, 4000 Liège, Belgium
2. Biomolecular and organic electronics, IFM, Linköping University, S-581 83 Linköping, Sweden
3. Department of Chemistry, Addis Ababa University, PO Box 1176, Addis Ababa, Ethiopia