1. Department of Physics and Astronomy, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, UK
2. Department of Physics and Mathematics, University of Hull, Robert Blackburn Building, Hull HU6 7RX, UK
3. Organic Functional Molecules, Organic Chemistry, University of Wuppertal, Gaußstrasse 20, 42119 Wuppertal, Germany
4. Department of Chemistry, The University of Sheffield, Dainton Building, Brook Hill, Sheffield, S3 7HF, UK
5. Macromolecular Chemistry Group and Wuppertal Center for Smart Materials & Systems (CM@S), Bergische Universität Wuppertal, Gauss-Strasse 20, 42119 Wuppertal, Germany