1. Faculty of Sciences, Institute of Chemistry, Department of Inorganic Chemistry, P. J. Šafárik University in Košice, Moyzesova 11, 041 54 Košice, Slovakia
2. Instituto de Nanociencia y Materiales de Aragón (INMA) and Departamento de Química Inorgánica, CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
3. Faculty of Sciences, Institute of Physics, P. J. Šafárik University in Košice, Park Angelinum 9, 041 54 Košice, Slovakia
4. Instituto de Síntesis Quimica y Catálisis Homogénea (ISQCH), Departamento de Química Inorgánica, Pedro Cerbuna 12, University of Zaragoza−CSIC, E-50009 Zaragoza, Spain