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Hexafirina doblemente N-confundida: una nueva porfirina expandida aromática que complica los bis-metales en el núcleo

Alagar Srinivasan¹, Tomoya Ishizuka, Atsuhiro Osuka

¹Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.

Journal of the American Chemical Society

|January 23, 2003

Resumen

Las hexafirinas N-confundidas recientemente sintetizadas y sus complejos metálicos exhiben propiedades estructurales únicas. Estos macrociclos pueden lograr la planaridad a través de la unión de hidrógeno o la coordinación de metales, lo que afecta su comportamiento electrónico.

Área de la Ciencia:

Química supramolecular de las moléculas.
Síntesis orgánica La síntesis orgánica.
Coordinación Química de la Coordinación

Sus antecedentes:

Las hexafirinas N-confundidas son compuestos macrocíclicos con propiedades estructurales y electrónicas únicas.
La sustitución de pentafluorofenilo influye en el entorno estérico y electrónico de las hexafirinas.
La complejación metálica es una estrategia común para afinar las propiedades de los ligandos macrocíclicos.

Objetivo del estudio:

Para sintetizar nuevas hexafirinas N-confundidas sustituidas por meso-hexakis ((pentafluorofenilo) y sus complejos metálicos.
Para investigar las características estructurales y la planaridad de estos compuestos.
Para explorar la influencia de los iones metálicos y la coordinación del disolvente en la estructura macrocíclica.

Principales métodos:

Síntesis de los derivados de la hexafirina N-confundidos.
Difracción de un solo cristal de rayos X para elucidación estructural.
Espectroscopia UV-vis y mediciones de susceptibilidad magnética para la caracterización.

Principales resultados:

La hexafirina (5) oxidada con base libre mostraba una estructura plana debido a una red interna de enlaces de hidrógeno.
Se formó y caracterizó con éxito un complejo planar bis-Cu(II).
El complejo bis-Ni (II) (7) adoptó una estructura distorsionada que se volvió plana tras la coordinación con el acetonitrilo.

Conclusiones:

Las hexafirinas N-confundidas meso-hexaquistas ((pentafluorofenilo) sustituidas pueden lograr la planaridad a través de diferentes mecanismos.
La coordinación de los metales y las interacciones con los disolventes juegan un papel crucial en la determinación de la estructura final de estos complejos.
La flexibilidad estructural de estos complejos de hexafirina ofrece el potencial para ajustar sus propiedades fotofísicas y electrónicas.

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