1. Instituto de QuímicaUniversidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria Mexico City Mexico
2. Institute of Materials ResearchNational Autonomous University of Mexico, Circuito Exterior, Ciudad Universitaria Mexico City Mexico
3. Department of Analytical and Physical ChemistryUniversity of Oviedo Oviedo Spain
4. Universidad Iberoamericana, Prolongacion Paseo de Reforma 880 Mexico City Mexico