1. Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 16610 Prague, Czech Republic
2. Materials Science Program, Department of Chemistry, Addis Ababa University, P. O. Box 1176, Addis Ababa 1176, Ethiopia
3. Department of Chemistry, University of Botswana, Notwane Rd, P/bag
UB 00704 Gaborone, Botswana
4. Department of Physics, School of Electrical and Electronics Engineering, SASTRA Deemed University, Thanjavur, 613 401 Tamil Nadu, India
5. Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 390 002, India