1. Department of Chemistry, National Taras Shevchenko University, Volodymyrska
St. 64, 01601 Kiev, Ukraine
2. Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie St. 14, 50-383
Wroclaw, Poland
3. Department
of Chemistry, University of Joensuu, PO
Box 111, FI-80101 Joensuu,
Finland