1. WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
2. Institute of Physical-Organic Chemistry and Coal Chemistry, 02160 Kyiv, Ukraine
3. Institute of Photonics, Department of Physics, University of Strathclyde, Glasgow G1 1RD, U.K.
4. Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, U.K.