1. School of Engineering
and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
2. Institut für
Anorganische and Physikalische Chemie, Universität Bremen, Leobener Strasse, 28334 Bremen, Germany
3. Department
of Chemistry, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, Arany Janos
Str. No. 11, RO-400028 Cluj-Napoca, Romania