1. Institute of Physical Chemistry, University of Münster, Corrensstraße 28/30, 48149 Münster, Germany
2. Center for Soft Nanoscience, University of Münster, Busso-Peus-Straße 10, 48149 Münster, Germany
3. Chevron Energy Technology Company, Richmond, California 94804, United States
4. Organisch-Chemisches Institut, University of Münster, 48149 Münster, Germany