1. Institute of Chemistry and Biochemistry Freie Universität Berlin Fabeckstr. 34/36 14195 Berlin Germany
2. Laboratory of Inorganic Materials Universidade Federal Santa Maria 97105-900 Santa Maria RS Brazil
3. Institute of Chemistry and Biochemistry Core Facility BioSupraMol Freie Universität Berlin Takustr. 3 14195 Berlin Germany
4. Department of Physics Universidade Federal Santa Maria 97105-900 Santa Maria RS Brazil