1. Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355009, Russia
2. Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX, 78666, USA
3. Department of Chemistry, Emory University, Atlanta, GA, 30322, USA
4. Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, KS 66045, USA