1. Institute of Applied Physics, Academy of Sciences of Moldova, Academiei 5, MD-2028 Chisinau, Republic of Moldova
2. Institut für Anorganische Chemie, RWTH Aachen University, D-52074 Aachen, Germany
3. Institute of Chemistry, Academy of Sciences of Moldova, Academiei 3, MD-2028 Chisinau, Republic of Moldova
4. Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland