1. Institute of Organic Chemistry, Center for Nanosystems Chemistry, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
2. International Tomography Center, Institutskaya 3a, Novosibirsk 630090, Russia and Novosibirsk State University, Novosibirsk 630090, Russia
3. Department of Chemistry, University of Konstanz, Universitätsstraße 14, 78457 Konstanz, Germany