Video Experimental Relacionado
Updated: Jan 26, 2026
11:27
Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
49.1K
Exploración topológica en estructuras de metales orgánicos de tierras raras altamente conectadas mediante control
Yutong Wang1, Liang Feng2, Weidong Fan1
1School of Materials Science and Engineering, College of Science , China University of Petroleum (East China) , Qingdao , Shandong 266580 , China.
Journal of the American Chemical Society
|April 6, 2019
Resumen
Los investigadores desarrollaron nuevos marcos de metales orgánicos de tierras raras (MOF) altamente conectados mediante la sintonización de sustituyentes de enlaces. Esta estrategia de control estérico desbloquea nuevas topologías y estructuras porosas complejas para aplicaciones avanzadas.
Área de la Ciencia:
- Ciencias de los materiales
- Química
- La cristalografía
Sus antecedentes:
- Las estructuras metal-orgánicas (MOF) altamente conectadas ofrecen un potencial significativo, pero están limitadas por las topologías y los grupos de metales disponibles.
- El desarrollo de estrategias para nuevas topologías de MOF es crucial para expandir sus aplicaciones.
Objetivo del estudio:
- Construir MOF de tierras raras altamente conectadas con topologías sin precedentes.
- Explorar el impacto del obstáculo estérico sintonizado sistemáticamente en los enlaces en la estructura y la topología de MOF.
- Proporcionar un plan para el diseño de materiales porosos complejos.
Principales métodos:
- Selección deliberada de enlaces tritópicos con sustituyentes sintonizables sistemáticamente.
- Construcción de estructuras metálicas orgánicas de tierras raras.
- Utilizando estrategias de enlace mixto y simulación molecular para controlar el obstáculo estérico y predecir estructuras.
Principales resultados:
- Formación de una nueva topología (3,9) -c sep utilizando enlaces simétricos C2v y racimos RE6.
- Descubrimiento de una topología (3,3,18)-cytw mediante la adaptación de racimos RE6 a racimos RE9 con enlaces simétricos C1.
- Síntesis de un MOF basado en RE9 con una topología flg (3,3,12)-c utilizando enlaces mixtos con impedimento estérico controlado.
- Las simulaciones moleculares confirmaron el papel del obstáculo estérico en la determinación de las estructuras de MOF.
Conclusiones:
- El ajuste estérico sistemático de los sustituyentes de enlace es una estrategia poderosa para descubrir nuevas topologías de MOF.
- Los grupos de tierras raras adaptables se pueden aprovechar para crear estructuras de red complejas.
- Este enfoque proporciona una plataforma versátil para el diseño de materiales porosos avanzados con propiedades a medida.
Videos de Conceptos Relacionados
01:09Levels of Organization
139.5K
Biological organization is the classification of biological structures, ranging from atoms at the bottom of the hierarchy to the Earth's biosphere. Each level of the hierarchy represents an increase in complexity that builds upon the previous level.
Molecules Are Composed of Atoms, and Biomolecules Are Assembled from Molecules:
The most basic levels include atoms, molecules, and biomolecules. Atoms, the smallest unit of ordinary matter, are composed of a nucleus and electrons. Molecules...
Molecules Are Composed of Atoms, and Biomolecules Are Assembled from Molecules:
The most basic levels include atoms, molecules, and biomolecules. Atoms, the smallest unit of ordinary matter, are composed of a nucleus and electrons. Molecules...
139.5K
03:06Alkali Metals
24.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
24.3K
02:06Conditions on Early Earth
101.0K
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
101.0K
01:23Dietary Connections
61.6K
In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used...
61.6K
02:32Bonding in Metals
52.2K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
52.2K
02:37Metallic Solids
20.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.5K