1. Università degli Studi, Dipartimento di Chimica, Laboratorio di Chimica Inorganica e Bioinorganica, Via Gino Capponi 7, Florence I-50121, Italy
2. University of Bucharest, Department of Chemistry, Bd. Republicii 13, Bucharest, Romania
3. “I.G. Murgulescu” Institute of Physical Chemistry, Academia Romana, Spl. Independentei 202, Bucharest R-77208, Romania