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Ingeniería de Cristal de Cristal Helical girado a mano
Subhankar Saha1, Gautam R Desiraju1
1Solid State and Structural Chemistry Unit, Indian Institute of Science , Bangalore 560 012, India.
Journal of the American Chemical Society
|January 13, 2017
Resumen
Los investigadores desarrollaron una estrategia para crear cristales helicoidales girados a mano. Esto implica la transformación de cristales plásticos unidimensionales en cristales elásticos bidimensionales, lo que permite un comportamiento plástico único y formas helicoidales.
Área de la Ciencia:
- Ingeniería de Cristal
- Ciencias de los materiales
- Química supramolecular
Sus antecedentes:
- El diseño de cristales plásticos con morfologías específicas es crucial para los materiales avanzados.
- Los métodos existentes a menudo carecen de control sobre las estructuras helicoidales macroscópicas.
- Comprender las interacciones moleculares es clave para controlar la plasticidad del cristal.
Objetivo del estudio:
- Para esbozar una nueva estrategia para el diseño de cristales helicoidales girados a mano.
- Para explorar la transformación de los cristales elásticos unidimensionales (1D) a los bidimensionales (2D).
- Para investigar la relación entre la plasticidad cristalina y la morfología helicoidal.
Principales métodos:
- Comenzando con un cristal de plástico de una dimensión (1,4-dibromobenzeno).
- Modificándolo a un cristal elástico en 1D (4-bromofenil 4'-clorobenzoato) utilizando sintones moleculares.
- Transición a cristales elásticos en 2D (por ejemplo, 4-bromofenil 4'-nitrobenzoato) mediante el emparejamiento de enlaces halógenos e hidrógenos.
- Variación de la fuerza de interacción para inducir la plasticidad en cristales 2D.
Principales resultados:
- Transformación exitosa de plástico 1D a elástico 1D, luego a cristales elásticos 2D.
- Identificación de cristales elásticos 2D con dos pares de caras plegables y comportamiento plástico isotrópico.
- Demostración de que estos cristales pueden ser torcidos a mano en estructuras helicoidales.
- Propuesta del término "cristales helicoidales girados a mano" para estos materiales.
Conclusiones:
- La estrategia esbozada proporciona una vía para diseñar nuevas estructuras de cristal helicoidales.
- Los cristales elásticos 2D desarrollados exhiben una plasticidad única adecuada para formar morfologías helicoidales.
- Este trabajo introduce una nueva clase de cristales flexibles con aplicaciones potenciales en la ciencia de los materiales.
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