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Regulación de varios estados de la afinidad de unión del fosfato de dihidrógeno a un receptor de bis-urea sensible a
Sander J Wezenberg1, Matea Vlatković, Jos C M Kistemaker
1Centre for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen , Nijenborgh 4, 9747 AG, Groningen, The Netherlands.
Journal of the American Chemical Society
|November 18, 2014
Resumen
Un nuevo receptor de bis-urea cambia entre tres isómeros usando luz y calor. Esto permite la unión controlada de fosfato de dihidrógeno, lo que demuestra el potencial de los sistemas moleculares sensibles.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- La fotoquímica es la fotoquímica.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- El desarrollo de receptores moleculares sensibles es crucial para las tecnologías avanzadas de detección y separación química.
- El control de la conformación molecular y las propiedades de unión a través de estímulos externos como la luz y el calor sigue siendo un desafío significativo.
Objetivo del estudio:
- Diseñar y sintetizar un receptor de bis-urea capaz de la isomerización inducida por la foto y la térmica.
- Investigar las propiedades de unión aniónica de diferentes isómeros de receptores, centrándose en la selectividad y la afinidad.
- Demostrar el potencial para controlar la unión del sustrato a través de estímulos externos.
Principales métodos:
- Síntesis de un receptor de bis-urea sensible.
- Caracterización de isómeros mediante resonancia magnética nuclear (1H NMR) y espectroscopia UV-Vis.
- Estudios de unión de aniones a través de las titulaciones de RMN de 1H y la espectrometría de masas de ionización por electrospray (ESI-MS).
- Análisis computacional utilizando cálculos de la Teoría Funcional de la Densidad (DFT).
Principales resultados:
- El receptor de bis-urea se interconvirtió con éxito entre tres isómeros distintos provocados por la luz y el calor.
- Se observó una alta selectividad para la unión de aniones de fosfato de dihidrógeno en todos los isómeros.
- Se encontraron variaciones significativas en la afinidad de unión al dihidrógeno fosfato entre los diferentes isómeros.
- Los cálculos de DFT proporcionaron una racionalización para las diferencias de afinidad de enlace observadas.
Conclusiones:
- La isomerización fototérmica y térmica proporciona un mecanismo viable para modular las propiedades de unión del receptor de bis-urea.
- Las diferencias observadas en la afinidad de unión permiten la captura y liberación controladas de fosfato de dihidrógeno de manera gradual.
- Este trabajo presenta una estrategia prometedora para el desarrollo de sistemas moleculares conmutables para el reconocimiento y separación de aniones.
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