1. Department of Physical Chemistry, University of Debrecen, Egyetem tér 1, Debrecen H-4032, Hungary
2. Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
3. MTA-DE Redox
and Homogeneous Catalytic Reaction Mechanisms Research Group, Debrecen, P.O. Box 400, H-4002, Hungary