Search research articles

ACERCA DE JoVE

Visión General Liderazgo Blog Centro de Ayuda JoVE

AUTORES

Proceso de Publicación Consejo Editorial Alcance y Políticas Revisión por Pares Preguntas Frecuentes Enviar

BIBLIOTECARIOS

Testimonios Suscripciones Acceso Recursos Consejo Asesor de Bibliotecas Preguntas Frecuentes

INVESTIGACIÓN

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archivo

EDUCACIÓN

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Centro de Recursos para Profesores Sitio de Profesores

Términos y Condiciones de Uso

Política de Privacidad

Videos de Conceptos Relacionados

Conformations of Cyclohexane

Conformations of Cyclohexane

Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...

Network Covalent Solids

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

MO Theory and Covalent Bonding

MO Theory and Covalent Bonding

The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

Newman Projections

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por

Same author

Programmable energy transfer in multivariate porphyrin-based 3D covalent organic frameworks.

Chemical communications (Cambridge, England)·2026

Same author

Cu(I)-cluster-based covalent organic frameworks with open metal sites and tuned microporosity for efficient C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> separation.

Chemical communications (Cambridge, England)·2026

Same author

Covalent Organic Framework Photo- and Electrocatalysts for Nitrogen Conversion: Recent Advances and Perspectives.

Chemistry, an Asian journal·2026

Same author

Porphyrin-based covalent organic frameworks for electrocatalytic NO<sub><i>x</i></sub> reduction and C-N coupling reactions.

Chemical communications (Cambridge, England)·2026

Same author

Fluorine-engineered two-dimensional covalent organic frameworks for enhanced C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> separation.

RSC advances·2026

Same author

Regulating Built-in Electric Fields in Methylquinoline-Derived Vinylene-Linked Covalent Organic Frameworks for Enhanced Photocatalytic H<sub>2</sub>O<sub>2</sub> Production.

Angewandte Chemie (International ed. in English)·2026

Search research articles

Video Experimental Relacionado

Updated: Sep 17, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

Cuadrados orgánicos covalentes 2D con topología de defecto cpt habilitados por una estrategia de división de nodos

Jialiang Liu¹, Guangshan Zhou¹, Jingming Yang²

¹College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

Journal of the American Chemical Society

|June 27, 2025

Resumen

Los investigadores desarrollaron un nuevo método de división de nodos para crear marcos orgánicos covalentes (COF). Esta estrategia genera topologías únicas de defecto cpt, lo que permite una recuperación eficiente de iones de oro con una alta capacidad de adsorción.

Más Videos Relacionados

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

Videos de Experimentos Relacionados

Last Updated: Sep 17, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

Área de la Ciencia:

Ciencias de los materiales
Química supramolecular
Nanotecnología

Sus antecedentes:

La química reticular permite la síntesis de marcos orgánicos covalentes 2D (2D COF) con propiedades ajustables.
La integración de los grupos funcionales en los FOC manteniendo el orden estructural es un desafío sintético.

Objetivo del estudio:

Introducir una nueva estrategia de división de nodos para el diseño de COF 2D con topologías de ingeniería.
Investigar la formación de nanotraps enlazados con hidrógeno dentro de la estructura de COF.
Evaluar el rendimiento de los COF en la recuperación de iones de oro.

Principales métodos:

Se empleó un enfoque de división de nodos para modificar la topología cpt, creando una nueva topología de defecto cpt.
El enlace direccional de hidrógeno se utilizó para dirigir el autoensamblaje de las estructuras de COF.
Se realizaron experimentos de adsorción para evaluar la eficiencia de la recuperación de iones de oro.
Se realizaron cálculos de la teoría funcional de la densidad (DFT) para comprender el mecanismo de unión.

Principales resultados:

La estrategia de división de nodos generó con éxito COF con una topología de defecto cpt con nanotraps enlazados con hidrógeno.
El COF-36 sintetizado demostró una capacidad excepcional de adsorción de iones de oro (Au3+) (1725 mg g-1) y una eficiencia de eliminación (> 99%) en medios ácidos.
Los cálculos de DFT revelaron que la geometría de la cavidad de la nanotrapa complementa el anión [AuCl4], lo que facilita un fuerte enlace de hidrógeno.

Conclusiones:

La división de nodos es un método versátil para la ingeniería topológica y funcional de los COF.
Los FOC desarrollados muestran un potencial significativo para aplicaciones en la recuperación de metales preciosos.
El estudio pone de relieve la importancia del diseño estructural para lograr materiales de alto rendimiento.