Video Experimental Relacionado
Updated: Dec 31, 2025
09:22
Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
Published on: February 7, 2017
8.2K
Evolución de la quiralidad de los nanocables de sub-1 nanómetro a la estructura helicoidal macroscópica
Simin Zhang1, Wenxiong Shi2, Shujian Rong1
1Lab of Organic Optoelectronics and Molecular Engineering Department of Chemistry , Tsinghua University , Beijing 100084 , China.
Journal of the American Chemical Society
|January 7, 2020
Resumen
Los investigadores lograron ensamblajes helicoidales eficientes y libres de ligandos de nanocables subnanométricos. Este estudio demuestra la transferencia de quiralidad de los nanocables inorgánicos a las moléculas achirales, aclarando la evolución en las estructuras jerárquicas.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- Química supramolecular
Sus antecedentes:
- La evolución de la quiralidad en las estructuras jerárquicas inorgánicas desde los niveles moleculares hasta los macroscópicos se entiende mal.
- El desarrollo de materiales inorgánicos quirales sin ligandos quirales o dopantes presenta un desafío significativo.
Objetivo del estudio:
- Investigar la formación de conjuntos helicoidales macroscópicos a partir de nanocables de tamaño subnanométrico.
- Para explorar la transferencia de quiralidad de ensamblajes inorgánicos a moléculas achirales.
- Para aclarar el papel de la quiralidad de los nanocables en el autoensamblaje.
Principales métodos:
- Autoensamblaje inducido por la evaporación de los nanocables subnanométricos.
- Observación de la luminiscencia polarizada circularmente.
- Simulaciones de dinámica molecular.
Principales resultados:
- Se prepararon conjuntos helicoidales macroscópicos de nanocables subnanométricos con una eficiencia del 100%, sin ligandos quirales ni dopantes.
- Se observó luminiscencia polarizada circularmente en conjuntos que contenían tintes fluorescentes orgánicos achirales.
- Las simulaciones de dinámica molecular confirmaron el papel crucial de la quiralidad de los nanocables en la formación de estructuras helicoidales.
Conclusiones:
- Demostró un método fácil para crear conjuntos helicoidales inorgánicos quirales.
- Estableció un mecanismo para la transferencia de quiralidad de los nanocables inorgánicos a las moléculas achirales.
- Proporcionó información sobre los principios fundamentales de la evolución de la quiralidad en los nanomateriales.
Videos de Conceptos Relacionados
02:30Chirality in Nature
16.4K
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.
16.4K
02:05Prochirality
4.8K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
4.8K
02:25Chirality
28.8K
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...
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...
28.8K
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
6.7K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
6.7K
02:25Molecules with Multiple Chiral Centers
14.7K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
14.7K
02:33Stereoisomerism of Cyclic Compounds
10.8K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
10.8K