1. School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics; Georgia Institute of Technology; Atlanta Georgia 30332-0400 USA
2. Department of Chemistry & Biochemistry; University of Arizona; Tucson Arizona 85721-0041 USA
3. National Renewable Energy Laboratory; 1617 Cole Blvd. Golden Colorado 80401 USA
4. Department of Chemistry; King Abdulaziz University; Jeddah 21589 Saudi Arabia