Un estudio cinético de la oxo-transferencia fotoinducida usando un complejo de Mo anclado a TiO2
DOI:
https://doi.org/10.17533/udea.redin.20200477Palabras clave:
flujo fotónico, fotooxidación selectiva, complejo dioxo-Molibdeno, rendimiento cuánticoResumen
El estudio cinético de la reacción de transferencia de átomos de oxígeno (TAO) foto asistida se estudió usando un complejo de dioxo-Mo anclado al TiO2, estimulada por la luz en condiciones ambientales usando trifenilfosfina como molécula modelo. La cinética de la reacción TAO fue estudiada con tres sistemas catalíticos anclados al TiO2: 4,4’-dicarboxilato-2,2’-bipiridina-dioxocloromolibdeno (MoO2L/TiO2), H2MoO4 (H2MoO4/TiO2) y óxido de molibdeno (MoO3/ TiO2).. El catalizador MoO2L/TiO2 permitió la conversión más alta del 90% y una selectividad (al óxido de fosfina) cercana al 100%. MoO3/TiO2 no permitió la oxo-transferencia sugiriendo la importancia del ligando bipiridinico como una conexión electrónica entre la unidad MoO2L y el TiO2. Adicionalmente, se observó que cuando se incrementa el flujo fotónico, el rendimiento cuántico y la concentración inicial de la PPh3, aumenta la velocidad de reacción de la TAO para el sistema MoO2L/TiO2.
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