Selectividad teórica de la N,N'-((1,3-fenilenbis(azanediil))bis(carbonotioil))bis(furan-2carboxamida) como ionóforo de electrodo selectivo a iones Plomo(II)
Palabras clave:
DFT; M06L; ESI; Selectividad.Resumen
El presente trabajo calcula teóricamente la afinidad de la N,N'-((1,3-fenilenbis (azanediil))bis(carbonotioil))bis(furan-2-carboxamida) como ionóforo de un electrodo selectivo a iones plomo (II). Para ello se calculó la energía de unión ionóforo-Pb2+, al igual que para las principales interferencias reportadas: Cu2+, Hg2+, Zn2+, Ni2+, Co2+, Ca2+ y Cd2+. Las geometrías y energías fueron optimizadas empleando la Teoría del Funcional de la Densidad con el funcional M06L y tres combinaciones de conjuntos de base diferentes. Para el cálculo de la energía de solvatación se empleó el modelo SMD. Las energías relativas obtenidas por las dos primeras combinaciones de conjuntos de base discrepan con los resultados experimentales. Sin embargo, la tercera combinación ratifica la evidencia experimental de la preferencia de este ionóforo hacia los iones Cu2+ y Pb2+ y la menor selectividad hacia el resto de las interferencias, excepto para los iones Ni2+, cuyas energías relativas son mayores que las de cualquier otro ion.
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