1. Department of Physical Electronics, Institute of Physics of NAS of Ukraine, Nauky ave., 46, Kyiv 03028, Ukraine
2. Department of Organic Chemistry, Igor Sikorsky Kiev Polytechnic Institute, Peremogi ave., 37, Kyiv 03056, Ukraine
3. Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
4. Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany