**Author details**

Juan C. Contreras-Ruiz<sup>1</sup> , Sonia Martínez-Gallegos<sup>1</sup> \*, Jose L. García-Rivas<sup>1</sup> , Julio C. González-Juárez<sup>1</sup> and Eduardo Ordoñez<sup>2</sup>

\*Address all correspondence to: soniazteca@hotmail.com

1 Technological Institute of Toluca, Metepec, México

2 Department of Chemistry, National Institute of Nuclear Research, Mexico City, México
