1. Chemistry Department, University of Crete, Voutes Campus, P.O. Box 2208,
71003 Heraklion, Crete, Greece
2. Department of Chemistry and
Pharmacy, Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Egerlandstrasse 3 91058 Erlangen, Germany