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Control de la plantilla sobre la dimerización y la selectividad de invitados de las jaulas de coordinación
Sabrina Freye1, Reent Michel, Dietmar Stalke
1Institute for Inorganic Chemistry, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany.
Journal of the American Chemical Society
|May 24, 2013
Resumen
Los investigadores desarrollaron nuevas jaulas de coordinación utilizando ligandos modificados. Estas jaulas pueden ser controladas por aniones para unirse selectivamente a diferentes huéspedes, demostrando un reconocimiento molecular sintonizable para la unión de aniones.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- Coordinación Química de la Coordinación
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los ligandos pirídicos bis-monodentados (L1) basados en la dibenzosuberona con Pd (II) forman jaulas de coordinación interpenetradas.
- El anión tetrafluoroborato (BF4-) modela la formación de la jaula y influye en la unión del huésped.
Objetivo del estudio:
- Investigar cómo la derivación de ligandos afecta la formación de la jaula y las propiedades de unión del huésped.
- Para controlar la dimerización de la jaula y la selectividad de aniones utilizando aniones de plantilla.
Principales métodos:
- Síntesis de nuevos ligandos (L2) con sustitutos de arilo voluminosos.
- Autoensamblaje de los complejos Pd(II) con ligandos L2.
- Experimentos de plantillación de aniones para controlar la estructura de la jaula y la unión del huésped.
Principales resultados:
- La derivación del ligando (L2) impide la plantillación BF4- de las jaulas dobles interpenetradas.
- Se forma una jaula monomérica [Pd2L(2)4] con L2.
- La plantilla de cloruro (Cl-) permite la dimerización a [Cl@Pd4L(2) 8].
- Las bolsas más grandes de la doble jaula derivada de L2 se unen selectivamente a grandes aniones como el perrenato (ReO4-).
Conclusiones:
- El diseño de los ligandos es crucial para controlar el ensamblaje supramolecular y la plantilla aniónica.
- El control con plantilla de aniones sobre la dimerización de la jaula permite la selectividad sintonizable de los invitados.
- Estos hallazgos avanzan en el diseño de sofisticados sistemas anfitrión-invitado.
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