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Los ligandos de tertienila y politertienila como ligandos hemilabílicos con conmutación redox para la captación y
D A Weinberger1, T B Higgins, C A Mirkin
1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.
Journal of the American Chemical Society
|July 18, 2001
Resumen
Los complejos de rutenio (II) con ligandos con conmutación redox ofrecen un control electroquímico sobre las propiedades del metal. La oxidación de los ligandos tertenilil sintoniza la afinidad de unión y los estados electrónicos, lo que afecta la captación y liberación molecular.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Coordinación Química de la Coordinación
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los ligandos de tertienilalquilfosfino sirven como componentes hemilabiles con conmutación redox en los complejos de rutenio (II).
- Estos ligandos permiten el control electroquímico de las propiedades electrónicas, los entornos de coordinación y la reactividad de los metales de transición.
Objetivo del estudio:
- Investigar el control electroquímico y las propiedades de los complejos mononucleares, dinucleares y poliméricos Ru (II).
- Para explorar la química de coordinación dependiente del estado de oxidación y las propiedades de absorción/liberación molecular.
Principales métodos:
- Síntesis y caracterización de los complejos mononucleares, dinucleares y poliméricos Ru (II).
- Espectroelectroquímica FT-IR para estudiar los cambios electrónicos durante la oxidación del ligando.
- Análisis electroquímico para comparar el comportamiento redox en diferentes arquitecturas complejas.
Principales resultados:
- El complejo mononuclear 4a mostró un aumento de tres órdenes en la afinidad de unión del acetonitrilo tras la oxidación del ligando.
- La oxidación del ligando en 4a eliminó la densidad de electrones del centro Ru, imitando la oxidación parcial de Ru a Ru.
- Los complejos poliméricos exhibieron estados electrónicos discretos debido a la localización de la carga, a diferencia de la sintonización continua en los análogos mononucleares.
Conclusiones:
- Los ligandos tertienilalquilfosfino proporcionan un ajuste electroquímico efectivo de las propiedades complejas de Ru.
- Las estructuras poliméricas muestran estados electrónicos distintos, limitando la sintonización continua pero ofreciendo propiedades únicas.
- La química de coordinación dependiente del estado de oxidación influye en las capacidades de absorción y liberación moleculares.
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