Video Experimental Relacionado
Updated: Jan 8, 2026
08:51
Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
Published on: August 18, 2017
10.9K
Isomerización quiroóptica en marcos orgánicos covalentes quirales con helicidad mesoscópica idéntica
Xinlin Zha1, Mengjuan Zuo1, Mengying Luo1
1Key Laboratory of Textile Fiber and Products, Ministry of Education, Wuhan Textile University, Wuhan, China.
Nature communications
|December 15, 2025
Resumen
Los investigadores descubrieron la isomerización quiroóptica en polímeros orgánicos covalentes (COPs) helicales. Los polímeros con helicidad idéntica mostraron actividades quiroópticas opuestas, ofreciendo nuevos principios de diseño para materiales quirales sintonizables.
Área de la Ciencia:
- Ciencia de Materiales
- Química de Polímeros
- Química Supramolecular
Sus antecedentes:
- La amplificación y transferencia de quiralidad son clave para crear polímeros orgánicos covalentes (COPs) helicales.
- La helicidad y la respuesta quiroóptica suelen correlacionarse en materiales quirales.
- No se había observado previamente un fenómeno distinto de isomerización quiroóptica en COPs helicales.
Objetivo del estudio:
- Investigar la isomerización quiroóptica en COPs helicales.
- Explorar la relación entre la helicidad mesoscópica y la actividad quiroóptica.
- Demostrar la transformación de COPs helicales en marcos orgánicos covalentes (COFs) conservando las propiedades quiroópticas.
Principales métodos:
- Se utilizó templado supramolecular para sintetizar poliiminas helicales.
- Se variaron sutilmente los parámetros de polimerización (estructura del monómero, disolvente).
- Las poliiminas helicales se convirtieron en COFs helicales mediante intercambio escalonado de enlazadores.
Principales resultados:
- Los COPs helicales con helicidad mesoscópica idéntica exhibieron actividades quiroópticas opuestas (efectos de Cotton invertidos).
- Esta isomerización se atribuye al empaquetamiento quiral opuesto de las unidades de construcción subnanométricas.
- La isomerización quiroóptica y la helicidad mesoscópica se conservaron durante la conversión a COFs.
Conclusiones:
- La isomerización quiroóptica es un fenómeno distinto en COPs y COFs helicales.
- Este descubrimiento permite principios de diseño avanzados para materiales quirales sintonizables.
- Los hallazgos proporcionan evidencia directa de la isomerización quiroóptica en COFs cristalinos.
Palabras clave:
isomerización quiroópticamarcos orgánicos covalentes quiraleshelicidad mesoscópicaefecto de Cottonmateriales quirales sintonizablespolímeros orgánicos covalentesredes orgánicas covalentesMás Videos Relacionados
Videos de Conceptos Relacionados
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
02:25Chirality
28.9K
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...
28.9K
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
02:52Stereoisomerism
13.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
13.8K
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
02:43Isomerism
22.8K
Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
22.8K