1. Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse 4, France; Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland; and Institute of Applied Radiation Chemistry, Technical University of Lodz, Wroblewskiego 15, 93-590 Lodz, Poland