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Amplificación de la selectividad del espín inducida por la quiralidad en marcos orgánicos covalentes helicoidales a

Xiaofeng Zhang¹, Shiguo Fu¹, Lei Jia¹

¹State Key Laboratory of Synergistic Chem-Bio Synthesis, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Journal of the American Chemical Society

|July 16, 2025

Resumen

La selectividad de espín inducida por quiralidad (CISS) en la espintrónica se mejora al encapsular fullerenos en marcos quirales. Esta estrategia de anfitrión-invitado aumenta significativamente la polarización de espín, allanando el camino para dispositivos electrónicos avanzados.

Área de la Ciencia:

Spintronics y electrónica molecular
Ciencias de los materiales quirales
Química supramolecular

Sus antecedentes:

La selectividad de espín inducida por quiralidad (CISS) es crucial para la espintrónica, pero se enfrenta a desafíos para lograr una alta polarización de espín ajustable.
La ingeniería precisa de las arquitecturas quirales y la modulación de las interacciones de espín-órbita son dificultades clave.

Objetivo del estudio:

Para amplificar el efecto CISS usando una estrategia de anfitrión-invitado.
Investigar la encapsulación del fullereno dentro de los marcos orgánicos covalentes quirales (CCOF) para mejorar la polarización del espín.

Principales métodos:

Síntesis de estructuras orgánicas covalentes hélices 3D enantioméricas (CCOF).
Encapsulación de los fullerenos (C60 y C70) dentro de los CCOF mediante autoensamblaje in situ.
Caracterización mediante dicroísmo circular (CD) y microscopía de fuerza atómica conductiva magnética (mc-AFM).

Principales resultados:

Los aductos de Fullerene@CCOF demostraron una clara transferencia de quiralidad con fuertes efectos de algodón.
La polarización del espín en CCOFs prístinos (46-50%) fue significativamente mejorada tras la encapsulación de fullereno.
La polarización del espín alcanzó el 77% con C60 y hasta el 90% con C70.

Conclusiones:

Las interacciones anfitrión-invitado proporcionan una plataforma robusta para modular el CISS en materiales quirales.
La encapsulación de fullereno, particularmente con C70, amplifica efectivamente la polarización de espín.
Este enfoque ofrece una ruta prometedora para el desarrollo de materiales y dispositivos espintrónicos avanzados.

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