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Un complejo de manganeso con una vida útil de transferencia de carga de metal a ligando de 190 ns
Sandra Kronenberger1, Robert Naumann1, Christoph Förster1
1Department of Chemistry, Johannes Gutenberg University Mainz, Mainz, Germany.
Nature communications
|August 22, 2025
Resumen
Este estudio introduce un complejo de manganeso con estados excitados de larga duración, lo que permite una fotoquímica sostenible. Este complejo metálico abundante en la tierra rivaliza con los metales preciosos en fotoactividad, allanando el camino para nuevas aplicaciones.
Área de la Ciencia:
- Química inorgánica
- La fotoquímica
- Ciencias de los materiales
Sus antecedentes:
- Los complejos de metales de transición fotoactivos a menudo se basan en metales preciosos (configuraciones 4/5d6) con estados de transferencia de carga triple de metal a ligando (3MLCT) de larga duración (> 100 ns).
- Los complejos metálicos 3d6 abundantes suelen tener vidas cortas en estado excitado (<2 ns) y síntesis complejas, lo que dificulta su uso práctico.
Objetivo del estudio:
- Desarrollar complejos de metales 3d6 fotoactivos utilizando metales abundantes en la tierra con propiedades de estado excitado comparables a los complejos de metales preciosos.
- Explorar el potencial de los complejos de manganeso con ligandos rígidos de carbeno/piridina para la fotoquímica sostenible.
Principales métodos:
- Síntesis de un complejo tetracarbeno de manganeso (I) [Mn (pbmi) 2+] a partir de un proligando de piridina de bis (imidazolio) disponible en el mercado y una sal de manganeso (II).
- Caracterización de las propiedades fotofísicas del complejo, incluida la vida útil de la fosforescencia y el comportamiento redox.
Principales resultados:
- El complejo [Mn(pbmi) 2+ sintetizado exhibe fosforescencia a temperatura ambiente desde un estado 3MLCT con una vida útil de 190 ns en solución fluida.
- El complejo posee un proceso redox reversible ([Mn(pbmi) 2+/+) y un estado excitado capaz de reducir la benzofenona.
- Las vidas de estado excitado alcanzadas rivalizan con las de los complejos de metales preciosos, lo que demuestra el potencial de alternativas abundantes en la tierra.
Conclusiones:
- Los complejos de manganeso (I) con ligandos rígidos de carbeno/piridina ofrecen una estrategia viable para crear complejos metálicos 3d6 fotoactivos con estados 3MLCT de larga duración.
- Este trabajo proporciona una base conceptual para el desarrollo de aplicaciones fotoquímicas sostenibles utilizando metales abundantes en la tierra.
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