Video Experimental Relacionado

Updated: Feb 15, 2026

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Published on: March 5, 2019

Diseño y montaje de jaulas de coordinación quirales para reacciones secuenciales asimétricas

Jingjing Jiao¹, Chunxia Tan¹, Zijian Li¹

¹School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, China.

Journal of the American Chemical Society

|January 19, 2018

Resumen

Los investigadores diseñaron jaulas de coordinación quirales para la catálisis asimétrica. Una jaula de enlace mixto catalizó eficientemente las reacciones secuenciales, mostrando una mayor actividad y enantioselectividad debido a la concentración y estabilización del reactivo.

Área de la Ciencia:

Química supramolecular
Química de la coordinación
Catalización asimétrica

Sus antecedentes:

Los nanorreactores supramoleculares con múltiples sitios catalíticos son cruciales para la catálisis asimétrica, pero son difíciles de sintetizar.
Los complejos de metalosalenos quirales ofrecen potencial para aplicaciones catalíticas.

Objetivo del estudio:

Diseñar y ensamblar jaulas de coordinación tetraédricas quirales de enlace único y de enlace mixto.
Para investigar la actividad catalítica de estos nanoreactores supramoleculares.

Principales métodos:

Síntesis de cinco jaulas de coordinación quirales utilizando ligandos dicarboxilados de los grupos enantiopuros Mn (salina), Cr (salina) y Fe (salina) y Cp3Zr3.
Caracterización mediante difracción de rayos X de un solo cristal / polvo, ICP-OES, Q-TOF MS y EDX.
Evaluación del rendimiento catalítico en reacciones secuenciales de epoxidación asimétrica de alquenos/apertura de anillos de epoxido.

Principales resultados:

Montaje exitoso de cinco jaulas de coordinación quirales con cavidades hidrofóbicas a nanoescala.
Demostración de una jaula de enlaces mixtos (Mn{\sal}/Cr{\sal}) como catalizador supramolecular eficiente.
Se obtiene hasta un 99,9% de enantioselectividad (ee) en reacciones asimétricas secuenciales.
Se observó una mayor actividad y enantioselectividad en comparación con los catalizadores libres.

Conclusiones:

Las jaulas de coordinación desarrolladas sirven como nanorreactores supramoleculares efectivos para la catálisis asimétrica.
El rendimiento del catalizador se mejora estabilizando los sitios activos y concentrando los reactivos dentro de la cavidad.
La adaptación de enlaces orgánicos ofrece una vía para diseñar nuevas arquitecturas supramoleculares funcionales.

Más Videos Relacionados

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

Published on: February 16, 2018

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Published on: October 15, 2019

Videos de Conceptos Relacionados

Chirality

Chirality

Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...

Coordination Number and Geometry

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

Chirality in Nature

Chirality in Nature

Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.

Coordination Compounds and Nomenclature

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

Lattice Centering and Coordination Number

Lattice Centering and Coordination Number

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...

Rotation of Asymmetric Top

Rotation of Asymmetric Top

By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...