* Corresponding authors

^a Unité de Chimie des Matériaux Inorganiques et Organiques (CMAT), Université catholique de Louvain (UCL), Place Pasteur 1, 1348 Louvain-la-Neuve, Belgium
E-mail: jean-francois.gohy@uclouvain.be
Fax: +32 10 479269

^b Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven

^c Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-University Jena, Humboldtstrasse 10, 07743 Jena, Germany
E-mail: ulrich.schubert@uni-jena.de
Fax: +49 3641 948202