1. Department of Chemistry, Tafila Technical University, P.O. Box 179, Tafila-66110, Jordan
2. Department of Chemistry, University College in Al-Qunfudah, Umm Al-Qura University, 1109 Makkah Al-Mukarramah, Saudi Arabia
3. Max-Planck-Institut fuer Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
4. Thyssenkrupp Bilstein GmbH, Thyssenkrupp Allee 1, 45143 Essen, Germany
5. Institute of Inorganic and Analytical Chemistry, Goethe-University, D-60438 Frankfurt, Germany
6. Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany