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Hexadecaphyrin- ((1.0.0.1.1.0.1.0.0.1.1.0.1)): Un ligando de doble sitio que apoya los cambios de conformación
Gonzalo Anguera1, Won-Young Cha2, Matthew D Moore1
1Department of Chemistry , The University of Texas at Austin , 105 East 24th Street, Stop A5300 , Austin , Texas 78712-1224 , United States.
Journal of the American Chemical Society
|February 23, 2018
Resumen
Se sintetizó un nuevo macrociclo de hexadecafirina y forma complejos bimetálicos de zinc y cobalto. Estos complejos exhiben conformaciones distintas y muestran potencial para su uso como sensores de calor.
Área de la Ciencia:
- Química supramolecular
- Síntesis orgánica
- Ciencias de los materiales
Sus antecedentes:
- Las porfirinas expandidas son compuestos macrocíclicos con propiedades electrónicas y estructurales únicas.
- Los complejos bimetales ofrecen oportunidades para nuevas funcionalidades debido a la interacción de múltiples centros metálicos.
- La flexibilidad conformacional en los macrociclos puede conducir a propiedades sintonizables.
Objetivo del estudio:
- Para sintetizar una nueva porfirina expandida, la hexadecafirina-
- Investigar la formación y caracterización de complejos bimetálicos de zinc y cobalto con la hexadecafirina sintetizada.
- Explorar el comportamiento conformacional y las propiedades electrónicas de estos complejos para aplicaciones potenciales.
Principales métodos:
- Reacción de condensación de un derivado hexapirrólico con un precursor cuaterpirrólico.
- Formación y caracterización de complejos bimetálicos de zinc, cobalto y mezcla de zinc y cobalto.
- Análisis espectroscópico (NMR, UV-Vis, espectrometría de masas) y difracción de rayos X de un solo cristal.
- Cálculos de la teoría funcional de la densidad (DFT) y espectroscopia de absorción transitoria.
Principales resultados:
- Síntesis exitosa del macrociclo de hexadecafirina con ocho enlaces directos de α-pirrol a α-pirrol.
- Formación de complejos bimetálicos estables de zinc y cobalto con estructuras conformacionales variables.
- Identificación de dos conformaciones estables e interconvertidas para el complejo bimetálico de cobalto en el mismo estado de oxidación.
- Caracterización estructural y electrónica detallada, incluidas las perspectivas de DFT sobre los efectos conformacionales.
Conclusiones:
- La nueva hexadecafirina sirve como un ligando versátil para construir sistemas bimetálicos complejos.
- La dinámica conformacional de los complejos metálicos es significativa e influye en sus propiedades electrónicas.
- Este sistema macrocíclico demuestra potencial como un sensor para el calor acumulado.
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