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Nuevo paradigma de diseño para el control del color en moléculas electrocrómicas de color anodicamente
Dylan T Christiansen1, Aimée L Tomlinson2, John R Reynolds1
1School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States.
Journal of the American Chemical Society
|February 23, 2019
Resumen
Los investigadores desarrollaron un nuevo método para diseñar moléculas electrocrómicas utilizando conjugación cruzada. Esta técnica permite un control preciso de los cambios de color, lo que permite que las soluciones incoloras se conviertan en negras vibrantes u opacas tras la oxidación.
Área de la Ciencia:
- Ciencias de los materiales
- Química orgánica
- La electroquímica
Sus antecedentes:
- Los materiales electrocrómicos cambian de color con el voltaje aplicado.
- El ajuste de las propiedades electrocrómicas es crucial para aplicaciones avanzadas.
- Los métodos existentes a menudo carecen de un control preciso del color y la estabilidad.
Objetivo del estudio:
- Establecer un nuevo paradigma de diseño para las moléculas electrocrómicas de color anódico.
- Demostrar control sobre los niveles de energía electrónica y ajuste de color.
- Desarrollar materiales para cambios de color ajustables y reversibles.
Principales métodos:
- Utilizó la conjugación cruzada en el diseño molecular.
- Niveles de energía electrónica controlados de estados catiónicos radicales independientemente.
- Las fuerzas del oscilador manipulado de las transiciones de cationes radicales.
Principales resultados:
- Logrado ajuste independiente de estados catiónicos neutrales y radicales.
- desplazado λmax de absorción de baja energía en más de 400 nm.
- Se crean estados neutros incoloros (que absorben los rayos UV) y cationes radicales vibrantes (verde, amarillo, rojo).
- Mezclas formuladas que pasan del negro incoloro al opaco.
Conclusiones:
- La conjugación cruzada ofrece una poderosa estrategia para diseñar moléculas electrocrómicas.
- Se puede lograr un control preciso del color y espectros de absorción ajustables.
- Los materiales desarrollados muestran potencial para pantallas negras dinámicas y opacas y ventanas inteligentes.
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