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La polimerización supramolecular en medios cristalinos líquidos: hacia la síntesis modular de cristales líquidos
Keiichi Yano1, Takahiro Hanebuchi1, Xu-Jie Zhang1
1Department of Chemistry and Biotechnology, School of Engineering , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-8656 , Japan.
Journal of the American Chemical Society
|May 30, 2019
Resumen
Los investigadores desarrollaron un nuevo método para crear cristales líquidos columnares de núcleo. Este nuevo material LC puede alinearse con campos eléctricos y magnéticos, lo que permite un ordenamiento unidireccional.
Área de la Ciencia:
- Química supramolecular
- Ciencias de los materiales
- Cristales líquidos
Sus antecedentes:
- La polimerización supramolecular ofrece una ruta modular para materiales complejos.
- Los cristales líquidos columnares (LC) exhiben propiedades únicas de autoensamblaje.
- El control de la orientación de las fases LC es crucial para las aplicaciones del dispositivo.
Objetivo del estudio:
- Extender un enfoque sintético modular para la construcción de cristales líquidos columnares de núcleo.
- Desarrollar el primer LC columnar de núcleo orientado por campos eléctricos y magnéticos.
- Para investigar el comportamiento de autoensamblaje de un derivado quiral específico de la benzenetricarboxamida en un medio LC nemático.
Principales métodos:
- La polimerización supramolecular de un derivado quiral de la benzenetricarboxamida (NODiscoNH*) en un medio de cristales líquidos nemáticos (LC) (4-ciano-4 ahydroxypentyloxybiphenyl, 5OCB).
- Caracterización de la fase cristalina líquida resultante y su ordenamiento estructural.
- Investigación de la respuesta del material a los campos eléctricos y magnéticos.
Principales resultados:
- La polimerización supramolecular de NODiscoNH* en 5OCB (1:3 proporción molar) indujo una transición de mesofasa de orden estructural creciente.
- Se formó una fase LC única ópticamente activa con una geometría columnar de núcleo-capa dispuesta hexagonalmente entre 113 y 51 °C.
- El LC columnar de núcleo exhibió una orientabilidad sin precedentes tanto por campos eléctricos como magnéticos, lo que condujo a un ordenamiento columnar unidireccional.
Conclusiones:
- El enfoque modular sintético es versátil para desarrollar LCs columnares multifuncionales.
- Se construyó con éxito el primer LC columnar de núcleo orientado por campos eléctricos y magnéticos.
- Este nuevo material abre posibilidades para aplicaciones avanzadas que requieren una alineación controlada de LC.
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