Diseño de diradicals estables basados en colorantes del grupo 13 de N₂O₂-Bis(fenolato) Aza-dipirrometeno y Aza-BODIPY

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Morris Oyelowo¹, Towhidi Illius Jeaydi², Christopher J Ziegler²

¹Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States.

Inorganic chemistry

|August 26, 2025

Resumen

Se sintetizaron nuevas moléculas diradicales basadas en tintes de aza-dipirrometeno que incorporan boro, aluminio, galio e indio. Estos compuestos exhiben propiedades magnéticas y estructuras electrónicas únicas, confirmadas por varios métodos espectroscópicos y computacionales.

Área de la Ciencia:

Química de coordinación
Síntesis orgánica
Ciencias de los materiales

Sus antecedentes:

Los tintes de aza-dipirrometeno son conocidos por su fuerte fluorescencia.
La incorporación de varios iones metálicos puede ajustar sus propiedades electrónicas y fotofísicas.

Objetivo del estudio:

Síntesis y caracterización de nuevos tintes de aza-dipirometano N2O2-bis (fenolato) con boro, aluminio, galio y indio.
Investigar la generación y las propiedades de las moléculas diradicales derivadas de estos tintes.

Principales métodos:

Oxidación química y electroquímica de los tintes sintetizados.
Espectroscopias magnéticas (RMN de temperatura variable de 1H, EPR, SQUID) para la caracterización del estado del suelo.
Cristalografía de rayos X para la confirmación estructural.
Cálculos de DFT y TDDFT para el análisis electrónico de la estructura.
Estudios electroquímicos del espectro.

Principales resultados:

Se han sintetizado con éxito los colorantes aza-BODIPY, aza-ALDIPY, aza-GADIPY y aza-INDIPY.
Se han generado moléculas diradicales (4b-7b) con estados básicos singlet de caparazón abierta y estados excitados triplet accesibles.
Se ha confirmado el carácter diradical y las distribuciones de densidad de espín.
Se ha observado la formación de especies de aniones radicales de valor mixto con absorción en el infrarrojo cercano tras la oxidación.

Conclusiones:

Los tintes de aza-dipirrometeno sintetizados que contienen metales se pueden oxidar para formar moléculas diradicales.
Estos diradicals poseen propiedades electrónicas y magnéticas únicas.
El estudio proporciona información sobre el comportamiento de los sistemas de caparazón abierto en complejos de coordinación.

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