1. Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium, Fax: +32‐1632‐7992,
2. Forschungszentrum Dresden‐Rossendorf, Institute of Radiochemistry, P. O. Box 510119, 01314 Dresden, Germany, Fax: +33‐476‐88‐2505
3. Institut Pluridisciplinaire H. Curien, CNRS‐IPHC/DRS, Chimie Nucléaire, B. P. 28, 67037 Strasbourg Cedex 2, France