1. Department
of Chemistry, University of South Florida, 4202 East Fowler Avenue, CHE205, Tampa, Florida 33620-5250, United States
2. Department
of Structural Chemistry, University of Milan, 21 Via G. Venezian, I-20133 Milan, Italy
3. Faculty
of Chemistry and Pharmacy, University of Sofia, 1 James Bourchier
Blvd., Sofia 1164, Bulgaria
4. UFR
Sciences et Technologies, Université Blaise Pascal, Clermont-Ferrand, 24 Avenue des Landais, 63170 Aubière, France
5. Physik
Department, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 3, 91058 Erlangen, Germany