* Corresponding authors

^a Department of Chemistry and Biochemistry, University Berne, Freiestrasse 3, Berne, Switzerland
E-mail: juerg.hulliger@iac.unibe.ch
Fax: +41 31 631 4241
Tel: +41 31 631 3993

^b Institute of Chemistry, University of Neuchâtel, Av. Bellevaux 51, Neuchâtel, Switzerland
E-mail: helen.stoeckli-evans@unine.ch
Fax: +41 32 718 2511
Tel: +41 32 718 2426

^c Department of Materials Chemistry, University of Milano-Bicocca, Via Cozzi 53, Milan, Italy
E-mail: piero.sozzani@mater.unimib.it
Fax: +39 02 6448 5400
Tel: +39 02 6448 5124

^d Institute of Organic Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, Freiberg, Germany
E-mail: edwin.weber@chemie.tu-freiberg.de
Fax: +49 37 3137 3170
Tel: +49 37 3139 2386