1. a Organic Materials Research Group, Department of Chemistry , Vanderbilt University , Nashville , TN , 37235 , USA
2. b Current address: Materials Science Division, Argonne National Laboratory , Argonne , IL , 60439 , USA
3. c Current address: Department of New Technology and Chemistry , Military University of Technology , Warsaw , Poland
4. d Section of Heteroorganic Compounds, University of Łódź , Łódź , Poland
5. e LC Vision, LLC, Inc. , Boulder , CO , 80305 , USA