Pieter J. Gilissen,1 Nicolas Vanthuyne,2 Ben L. Feringa,3,* Johannes A.A.W. Elemans,1,* and Roeland J.M. Nolte1,*
1Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, the Netherlands
2Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille, France. 3University of Groningen, Stratingh Institute for Chemistry, Nijenborgh 4, 9747 AG Groningen, the Netherlands