1. a Department of Physical Chemistry, Faculty of Chemical Technology , Slovak Technical University , Radlinského 9, SK-812 37 , Bratislava , Slovakia
2. b School of Pharmacy and Chemistry , Liverpool John Moores University , Byrom Street, Liverpool , L3 3AF , United Kingdom
3. c Department of Inorganic Chemistry, Faculty of Chemical Technology , Slovak Technical University , Radlinského 9, SK-812 37 , Bratislava , Slovakia