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Las diporfirinas cofaciales puenteadas con Pt (II) y Pt (IV) a través de enlaces sigma de metales de transición de

Shigeru Yamaguchi¹, Taisuke Katoh, Hiroshi Shinokubo

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

Journal of the American Chemical Society

|October 10, 2008

Resumen

Los investigadores sintetizaron una diporfirina cofacial con puente de platino (IV). La reducción al platino (II) indujo un cambio estructural y alteró la comunicación electrónica en este nuevo sistema molecular.

Área de la Ciencia:

Coordinación Química de la Coordinación
Química supramolecular de las moléculas.
Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

Las diporfirinas cofaciales son importantes estructuras supramoleculares con propiedades electrónicas sintonizables.
Los complejos de platino ofrecen características redox y estructurales únicas para los ligandos puentes.

Objetivo del estudio:

Para sintetizar una nueva diporfirina cofacial puenteada directamente con platino (IV).
Investigar las consecuencias estructurales y electrónicas de la reducción del puente de platino (IV) al platino (II).

Principales métodos:

Síntesis de la diporfirina a través de la ciclometalización de la beta-piridilporfirina con una sal de platino.
Manipulación de redox del puente de platino (IV) utilizando metilhidrazina.
Caracterización de la resultante de platino ((II) - puente dimer.

Principales resultados:

Síntesis exitosa de una diporfirina cofacial puenteada directamente con Pt (IV).
Reducción a una inversión de helicidad inducida por el centro Pt (II) en el complejo de la diporfirina.
Se observaron cambios significativos en la comunicación electrónica a través del puente de metal después de la reducción.

Conclusiones:

El estudio demuestra un método fácil para crear diporfirinas con puente de platino conmutables.
La inversión de helicidad observada y la comunicación electrónica alterada resaltan la naturaleza dinámica de estos sistemas.
Este trabajo proporciona una base para el diseño de materiales moleculares avanzados con propiedades controlables.

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