[1] Karlsruhe Inst Technol, Inst Organ Chem, D-76131 Karlsruhe, Germany
[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, CP 6165, BR-13083970 Campinas, SP, Brazil
[3] Karlsruhe Inst Technol, Light Technol Inst, D-76131 Karlsruhe, Germany
[4] Karlsruhe Inst Technol, Inst Phys Chem, D-76131 Karlsruhe, Germany
[5] Univ Helsinki, Inorgan Chem Lab, POB 55, FIN-00014 Helsinki, Finland
[6] Karlsruhe Inst Technol, Inst Toxicol & Genet, D-76344 Eggenstein Leopoldshafen, Germany