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Magnetismo libre de metales en marcos orgánicos covalentes dopados químicamente

Hongde Yu¹, Dong Wang¹

¹MOE Key Laboratory of Organic OptoElectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.

Journal of the American Chemical Society

|May 20, 2020

Resumen

Los investigadores desarrollaron un método para crear imanes orgánicos sin metales utilizando dopaje químico en marcos orgánicos covalentes (COF). Este enfoque introduce centros paramagnéticos estables, allanando el camino para nuevos dispositivos espintrónicos orgánicos.

Área de la Ciencia:

Ciencias de los materiales
Química orgánica
Física de la materia condensada

Sus antecedentes:

Lograr centros paramagnéticos estables en sistemas orgánicos puros para el magnetismo es un desafío.
Las estructuras orgánicas covalentes cristalinas (COF) ofrecen una plataforma sintonizable para explorar el magnetismo orgánico.

Objetivo del estudio:

Desarrollar una estrategia general para la introducción de espín de electrones no emparejados y magnetismo libre de metales en los COF de banda estrecha mediante dopaje químico.
Investigar los mecanismos de localización de la carga y la inducción del magnetismo en los COFs dopados.

Principales métodos:

Cálculos de la teoría funcional de la densidad (DFT) para modelar las interacciones dopante-COF.
Diseño y evaluación teórica de nuevos COF de banda estrecha.
Análisis de las propiedades de anisotropía magnética y de conducción de espín.

Principales resultados:

Identificó dopaje de energía que inyecta y localiza cargas a través de hibridación orbital y complejos de transferencia de carga.
Demostró que los estados electrónicos localizados crean centros paramagnéticos estables en los COF no magnéticos.
Diseñaron dos nuevos COF que muestran magnetismo potencial después del dopaje de yodo y aclararon la anisotropía magnética en COF 2D.

Conclusiones:

El dopaje químico proporciona una vía práctica para lograr un magnetismo libre de metales en los COF.
La estrategia permite la modulación de la conducción de espín y las interacciones magnéticas mediante el ajuste de los bloques de construcción de COF.
Este trabajo tiene un potencial significativo para el desarrollo de dispositivos espintrónicos orgánicos.

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