1. Institute of Chemistry; Organic Chemistry; Martin-Luther-University Halle-Wittenberg; Kurt-Mothes-Str. 2 06120 Halle Germany
2. Department of Chemistry; Faculty of Science; Cairo University; Giza Egypt
3. Institute for Experimental Physics; Otto-von-Guericke University Magdeburg; Universitätsplatz 2 39106 Magdeburg Germany