* Corresponding authors

^a Department Organic Chemistry II (Organic Materials and Combinatorial Chemistry), University of Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
E-mail: peter.baeuerle@chemie.uni-ulm.de
Fax: (+49) 731 502 2840

^b Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5-1, Higashi 1-1-1, Tsukuba 305-8565, Japan
E-mail: reiko.azumi@aist.go.jp
Fax: (+81) 29 861 6303

^c Fachbereich 8/Anorganische Chemie, Universität Essen, Universitätstrasse 5, D-45117 Essen, Germany
E-mail: roland.boese@uni-essen.de
Fax: (+49) 201 183 2416

^d Institut Català d'Investigació Química, Avgda. Països Catalans S/N, E-43007 Tarragona
E-mail: jbenet@iciq.es
Fax: (+34) 977 920 224