1. Indian Institute of Technology Mandi, School of Computing and Electrical Engineering, Mandi, Himachal Pradesh 175001, India
2. Indian Institute of Technology Mandi, School of Basic Sciences, Mandi, Himachal Pradesh 175001, India
3. Depto. de Química, Lab. de Nanotecnología e Ingeniería Molecular, CBI, UAM-I, Mexico D.F., Mexico
4. Universidade Federal do Rio Grande do Sul, UFRGS, Instituto de Química, Avenida Bento Gonçalves 9500, P.O. Box 15003, 91501-970 Porto Alegre, RS, Brazil