1. Institute
of Physical and Theoretical
Chemistry, University of Regensburg, Universitätsstrasse
31, D-93040 Regensburg, Germany
2. Institut de Chimie Séparative de Marcoule (ICSM), UMR 5257 (CEA/CNRS/UM2/ENSCM)BP
17171, 30207 Bagnols s/Céze cedex, France