1. School of Chemistry & Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32826, Institute of Physics, National Academy of Sciences, Kiev 03028, Ukraine, Institute of Organic Chemistry, National Academy of Sciences, Kiev 03094, Ukraine, and Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3TA, U.K.