1. Institute of Inorganic Chemistry, University of Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany
2. Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany
3. ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France