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Luminiscencia mecano-responsiva a través de transiciones de fase de cristal a cristal entre grupos espaciales
Mingoo Jin1, Tomohiro Seki1, Hajime Ito1
1Division of Applied Chemistry & Frontier Chemistry Center, Faculty of Engineering, Hokkaido University , Sapporo, Hokkaido 060-8628, Japan.
Journal of the American Chemical Society
|May 24, 2017
Resumen
Un nuevo material luminiscente mecanicamente sensible exhibe transiciones de fase de cristal a cristal. Los estímulos mecánicos desencadenan cambios en la estructura cristalina y las propiedades de emisión, lo que permite nuevas aplicaciones de materiales.
Área de la Ciencia:
- Ciencias de los materiales
- La cristalografía
- La fotofísica
Sus antecedentes:
- Los materiales luminiscentes mecano-responsivos (LMR) ofrecen propiedades ópticas dinámicas.
- El control de las transiciones de fase en estado sólido es clave para afinar el comportamiento del material.
Objetivo del estudio:
- Desarrollar un nuevo material de LMR que utilice transiciones de fase de cristal a cristal.
- Investigar la relación entre los cambios estructurales y la luminiscencia.
Principales métodos:
- Síntesis de un complejo de oro con una fracción de bifenilo.
- Inducción de las transiciones de fase a través de estímulos mecánicos (pinchazo, molienda).
- Caracterización de las estructuras cristalinas y propiedades de emisión.
Principales resultados:
- Un complejo de oro achiral formó una fase/aceite amorfa emisora de naranja.
- La estimulación mecánica indujo la cristalización en fases quirales o centrosimétricas con emisión alterada.
- La molienda de cristales quirales condujo a una transición de estado sólido a cristales achirales con cambios de emisión.
Conclusiones:
- Se ha demostrado un nuevo material de LMR basado en transiciones reversibles de fase de cristal a cristal.
- Estableció un vínculo entre la fuerza mecánica, la simetría cristalina y la luminiscencia.
- Destacó el potencial para el diseño de materiales inteligentes con salidas ópticas ajustables.
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