1. Department
of Chemistry and Pharmacy and Interdisciplinary Center for Molecular
Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, Germany
2. Institut Laue-Langevin
DS/LSS, 71 Avenue des Martyrs, F-38000 Grenoble, France