1. Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium, Department of Inorganic Chemistry, University of Technology and Economics, Gellert ter 4, H-1521 Budapest, Hungary, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Group of Computational Chemistry, Faculty of Chemical Engineering, HoChiMinh City University of Technology, Vietnam