[1] Univ Nacl Autonoma Mexico, Inst Quim, Dept Bioestruct, Mexico City 04510, DF, Mexico
[2] IPN, Escuela Nacl Ciencias Biol, Dept Quim Inorgan, Mexico City 11340, DF, Mexico
[3] Fac Quim, Dept Quim Inorgan & Nucl, Mexico City 04510, DF, Mexico
[4] Inst Tecnol Tijuana, Ctr Grad & Invest, Tijuana, Beja California, Mexico