1. Department of Chemistry, University of Warsaw, Pasteura 1, 02‐093 Warszawa, Poland, Fax: +48‐228220211 ext. 212
2. Cardinal Stefan Wyszyński University, College of Science, Department of Mathematics & Natural Science, Dewajtis 5, 01‐815 Warszawa, Poland
3. Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01‐224 Warszawa, Poland
4. Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01‐224 Warszawa, Poland