1. Vinc̆a Institute of Nuclear Sciences, Laboratory of Theoretical Physics and Condensed Matter Physics, P.O. Box 522, 11001 Belgrade, Serbia
2. Department of Chemistry, National Engineering College, K. R. Nagar, Kovilpatti - 628 503 Tamil Nadu, India
3. Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany
4. Department of Chemistry, Munich University (LMU), Butenandtstrasse 5-13, D-81377 München, Germany
5. Radiopharmaceuticals Division, Bhabha Atomic Research Centre, Mumbai 400 085, India