1. Centro de Química Estrutural, Faculdade de Ciências Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
2. BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany
3. Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor Strasse 2, D-12489 Berlin, Germany