1. Inorganic Chemistry Laboratory, Faculty of Chemistry, University of Bucharest, Str. Dumbrava Rosie no. 23, 020464 Bucharest, Romania, Laboratory of Molecular Magnetism, Dipartimento di Chimica & UdR INSTM di Firenze, Polo Scientifico, Via della Lastruccia 3, 50019 Sesto Fiorentino (Fi), Italy, and Laboratoire Chimie, Ingénierie Moléculaire et Matériaux d'Angers (CIMMA), UMR 6200 CNRS, Université d'Angers, UFR Sciences, Bât. K, 2 bd. Lavoisier, 49045 Angers, France