1. Institute of Inorganic Chemistry
2. University of Tübingen
3. 72076 Tübingen
4. Germany
5. Dipartimento di Chimica e Chimica Industriale
6. Università di Pisa
7. 56124 Pisa
8. Italy
9. Institute of Inorganic Chemistry and Analytical Chemistry
10. Johannes Gutenberg University of Mainz
11. 55128 Mainz