1. Department of Inorganic and Organic Chemistry University of Barcelona C. Martí i Franquès 1-11 08028 Barcelona Spain
2. Institute of Chemical Research of Catalonia (ICIQ) and The Barcelona Institute of Science and Technology Avgda. Països Catalans 16 43007 Tarragona Spain
3. Department of Chemistry and Applied Biosciences Institute for Chemical and Bioengineering ETH Zurich Vladimir-Prelog-Weg 1 8093 Zurich Switzerland
4. Catalan Institution for Research and Advanced Studies (ICREA) Pg. Lluís Companys 23 08010 Barcelona Spain
5. Institut de Nanociència i Nanotecnologia (IN2UB) Universitat de Barcelona 08028 Barcelona Spain
6. Covestro (Deutschland) AG Kaiser-Wilhelm-Allee 60 51373 Leverkusen Germany