Video Experimental Relacionado
Updated: May 7, 2026
06:35
Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
7.5K
Chiralidad superficial extendida de ensamblajes supramoleculares de moléculas quirales adsorbidas
1Leverhulme Centre for Innovative Catalysis and Surface Science Centre, Department of Chemistry, University of Liverpool, UK.
Nature
|April 4, 2000
Resumen
Las tecnologías quirales permiten el control de las reacciones químicas. Este estudio revela que los ensamblajes supramoleculares de ácido tartárico en superficies de cobre crean canales quirales, induciendo enantioselectividad en la síntesis química.
Área de la Ciencia:
- Ingeniería Química Ingeniería Química.
- Ciencia de los materiales Ciencia de los materiales.
- La catálisis es la catálisis.
Sus antecedentes:
- Las industrias química y farmacéutica requieren compuestos enantioméricamente puros.
- Las tecnologías quirales son cruciales para controlar la enantioselectividad en las reacciones químicas.
- La catálisis enantioselectiva heterogénea ofrece una producción y separación eficientes de productos quirales.
Objetivo del estudio:
- Investigar el mecanismo por el cual las moléculas quirales adsorbidas inducen enantioselectividad en superficies catalíticas.
- Para entender la estructura de la fase catalítica activa formada por el ácido (R,R) -tartárico en Cu{110}.
Principales métodos:
- Adsorción de moléculas de ácido (R,R) -tartárico en las superficies de Cu.
- Análisis de las fases superficiales y la formación de ensamblajes supramoleculares.
- Investigación del papel de la simetría superficial y los dominios quirales.
Principales resultados:
- La fase catalíticamente activa consiste en conjuntos supramoleculares extendidos de ácido (R,R) -tartárico.
- Estos ensamblajes rompen la simetría del metal y crean canales quirales.
- Estos canales quirales son responsables de impartir enantioselectividad mediante la orientación de las moléculas reactivas.
Conclusiones:
- El ensamblaje supramolecular de moléculas quirales puede crear dominios quirales extendidos en superficies.
- La formación de canales quirales es clave para lograr una catálisis enantioselectiva heterogénea.
- El control de la simetría superficial y la geometría de adsorción molecular es esencial para la enantioselectividad sostenida.
Videos de Conceptos Relacionados
02:25Chirality
23.8K
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...
23.8K
02:25Molecules with Multiple Chiral Centers
11.6K
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...
11.6K
02:33Stereoisomerism of Cyclic Compounds
9.3K
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,...
9.3K
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
5.5K
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...
5.5K
02:05Prochirality
4.0K
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...
4.0K
02:30Chirality in Nature
13.8K
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.
13.8K