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Diadas complejas de diamina de rodamina y platino como fotosensibilizadores eficientes y robustos para la reducción
Guocan Li1, Michael F Mark1, Hongjin Lv1
1Department of Chemistry, University of Rochester , Rochester, New York 14627, United States.
Journal of the American Chemical Society
|February 9, 2018
Resumen
Las nuevas díadas de rodamina-platino generan eficientemente combustible de hidrógeno a partir del agua utilizando luz visible. El ajuste de la estructura molecular mejora la producción de hidrógeno, lo que demuestra una estrategia clave para el diseño avanzado de fotosensibilizadores.
Área de la Ciencia:
- La fotoquímica
- Ciencias de los materiales
- Catálisis
Sus antecedentes:
- El desarrollo de fotosensibilizadores eficientes es crucial para la producción de combustible solar.
- Los tintes de rodamina (RDM) y los complejos de platino (Pt) son conocidos por sus propiedades fotofísicas.
Objetivo del estudio:
- Sintetizar y evaluar nuevos diodos de diamina de rodamina-Pt (PtN2S2) como fotosensibilizantes para la generación de hidrógeno (H2).
- Investigar las relaciones estructura-actividad que influyen en la eficiencia de la producción de H2.
Principales métodos:
- Síntesis de tres díadas RDM-PtN2S2 (Pt-RDM1, Pt-RDM2, Pt-RDM3) con diferentes sustituyentes de RDM.
- Caracterización espectroscópica (UV-Vis, absorción transitoria) y electroquímica.
- Experimentos de generación de H2 utilizando díadas inmovilizadas en nanopartículas de TiO2 platinizadas bajo irradiación de luz blanca.
Principales resultados:
- Las díadas exhibieron una fuerte absorción de luz visible y una eficiente generación de H2.
- Los números de rotación (TON) alcanzaron hasta 70.700 para Pt-RDM3 después de 40 horas de irradiación.
- Se observaron procesos de transferencia de energía y carga ultrarrápidos en picosegundos.
- La actividad de generación de H2 se correlacionó con los niveles de energía de los estados separados de carga excitados.
Conclusiones:
- Las díadas RDM-PtN2S2 son fotosensibilizantes efectivos para la producción de H2 a partir del agua.
- El ajuste de los sustituyentes RDM permite ajustar los niveles de energía del estado excitado y dirigir la fotoquímica.
- El diseño molecular juicioso de las díadas fotosensibilizadoras es vital para la recolección eficiente de luz y la transferencia de electrones fotoinducida en aplicaciones de combustible solar.
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