1. University of Pisa, Dipartimento di Chimica e Chimica Industriale, 56124 Pisa, Italy
2. CIRCC, Via Celso Ulpiani 27, I-70126 Bari, Italy
3. Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež-1001, 250 68 Řež, Czech Republic