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La liberación de NO fotoinducida por la irradiación de luz visible de los complejos de nitrosil rutenio con puentes

Marilia G Sauaia¹, Renata G de Lima, Antonio C Tedesco

¹Departamento de Química da Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. dos Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil.

Journal of the American Chemical Society

|December 3, 2003

Resumen

Este estudio detalla la síntesis y las propiedades fotoquímicas de un complejo de rutenio binuclear. La fotólisis de flash láser confirmó la liberación de óxido nítrico (NO) tras la irradiación, produciendo un producto específico de rutenio.

Área de la Ciencia:

Coordinación Química de la Coordinación
La fotoquímica es la fotoquímica.
Los complejos de rutenio.

Sus antecedentes:

Los complejos de rutenio binucleares son de interés por sus diversas propiedades electroquímicas y fotoquímicas.
La liberación de óxido nítrico (NO) de los complejos metálicos puede ser provocada por la luz, con aplicaciones potenciales en fotofarmacología.

Objetivo del estudio:

Para sintetizar y caracterizar un nuevo complejo de rutenio binuclear que contiene un ligando de nitrosilo.
Para investigar el comportamiento fotoquímico del complejo, centrándose específicamente en la liberación de óxido nítrico tras la irradiación.

Principales métodos:

Síntesis y caracterización del complejo binuclear utilizando análisis elemental, espectroscopia UV-vis y IR.
Estudios fotoquímicos que emplean la fotólisis del flash láser a 532 nm.
Cuantificación del óxido nítrico liberado utilizando un sensor de NO.
Determinación del rendimiento cuántico para la liberación de NO.

Principales resultados:

Se sintetizó y caracterizó con éxito el complejo binuclear [RuII ((NH3) 5 ((pz) RuII ((bpy) 2 ((NO)) ] ((PF6) 5).
La espectroscopia UV-vis reveló bandas de absorción características, con una banda significativa a los 530 nm.
La fotólisis de flash láser confirmó la liberación de óxido nítrico (NO) inducida por la luz con un rendimiento cuántico medido de 0,025 ± 0,004 mol einstein-1.
El producto primario de irradiación identificado fue [RuIII ((NH3) 5 ((pz) RuII ((bpy) 2 ((H2O)) 5+ junto con NO. liberado.

Conclusiones:

El complejo de rutenio binuclear sintetizado se somete a la liberación fotoquímica de óxido nítrico tras una irradiación de 532 nm.
El estudio proporciona información sobre la fotolabilidad del ligando de nitrosilo en este complejo específico de rutenio.
Los hallazgos contribuyen a la comprensión de los complejos de rutenio fotoactivo para aplicaciones potenciales de entrega de NO.

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