* Corresponding authors

^a Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Humboldtstrasse 10, 07743 Jena, Germany
E-mail: ulrich.schubert@uni-jena.de
Fax: +49 3641948202
Tel: +49 3641948201

^b Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands

^c Laboratory of Macromolecular Chemistry and Nanoscience Eindhoven, University of Technology, Den Dolech 2, 5600 MB Eindhoven, The Netherlands

^d Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
E-mail: jean-francois.gohy@uclouvain.be
Fax: +32 10479269

^e Dutch Polymer Institute (DPI), P. O. Box 902, 5600 AX Eindhoven, The Netherlands