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A Pd24 Nanoball Molecular Embarazada: Estelación auto-templada mediante el mapeo preciso de los sitios de
Imtiyaz Ahmad Bhat1, Dipak Samanta1, Partha Sarathi Mukherjee1
1Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
Journal of the American Chemical Society
|July 11, 2015
Resumen
Los investigadores crearon una nueva nanobola molecular M24L24 utilizando iones de paladio (II) y un nuevo ligando de pirimidina. Esta estructura presenta una "bola de bebé" interior enjaulada dentro de una "bola madre" más grande, lo que demuestra un control preciso de autoensamblaje.
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 de pirimidina generalmente forman complejos mononucleares simples debido a una coordinación débil.
- La construcción de arquitecturas supramoleculares más grandes y predecibles como las bolas moleculares requiere un diseño robusto de ligandos.
Objetivo del estudio:
- Para diseñar y sintetizar una pirimidina puenteado molecular nanoball.
- Para investigar el autoensamblaje de los iones de paladio (II) con un nuevo ligando de tris (II) -4- (pyrimidina) -5-il (fenil) amina.
- Para demostrar la encapsulación controlada de una unidad supramolecular más pequeña dentro de una más grande.
Principales métodos:
- El autoensamblaje de los iones palladio (II) con la tris (IV) -pirimidina (IV) -fenolamina.
- Caracterización estructural del complejo M24L24 resultante.
- Reacciones de intercambio de ligandos para formar una bola M12L24 más pequeña.
Principales resultados:
- Formación de una única nanobola molecular M24L24 (2) que comprende una "bola bebé" Pd12 puenteada por ligandos de pirimidina, apoyada por una "bola madre" Pd12 externa.
- La bola de bebé interior no podría formarse sin la bola madre externa, destacando el papel de las restricciones geométricas.
- Conversión exitosa de la nanobola M24L24 a una bola M12L24 más pequeña (3) utilizando un ligando dipiridil.
Conclusiones:
- Demostró una nueva estrategia de autoensamblaje para crear una nanobola molecular "embarazada" con una estructura interna encapsulada.
- Estableció un método para controlar la arquitectura supramolecular a través del diseño de ligandos y las restricciones geométricas.
- Mostró la fácil transformación de nanoestructuras complejas a través del intercambio de ligandos.
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