1. Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
2. WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, United Kingdom
3. Institute of Physical-Organic Chemistry and Coal Chemistry, 02160 Kyiv, Ukraine
4. Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, United Kingdom