Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Network Covalent Solids02:18

Network Covalent Solids

14.9K
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...
14.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.2K
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...
28.2K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

45.1K
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,...
45.1K
Carbon Skeletons01:12

Carbon Skeletons

111.1K
Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
111.1K
Structures of Solids02:22

Structures of Solids

15.7K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
15.7K
Ionic Crystal Structures02:42

Ionic Crystal Structures

15.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
15.5K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

Corrigendum to "Nobiletin from Citrus reticulata Blanco alleviates pulmonary fibrosis through inhibiting the PI3K/AKT pathway and epithelial-mesenchymal transition" [J. Ethnopharmacol. 349 (2025) 119965].

Journal of ethnopharmacology·2026
Same author

Electronic-Structure-Directed Pore Engineering in Metal-Organic Frameworks for Molecular Sieving of C<sub>3</sub>F<sub>6</sub>/C<sub>3</sub>F<sub>8</sub>.

Angewandte Chemie (International ed. in English)·2026
Same author

Metal-center electron affinity modulates multicolor electrochromism in 2D conjugated metal-organic frameworks.

Nature communications·2026
Same author

Corrigendum to "Nobiletin from Citrus reticulata Blanco alleviates pulmonary fibrosis through inhibiting the PI3K/AKT pathway and epithelial-mesenchymal transition" [J. Ethnopharmacol 349 (2025) 119965].

Journal of ethnopharmacology·2026
Same author

How loneliness and social isolation are linked to cognitive decline among older adults? A systematic review of underlying physiological and psychobehavioral mechanisms.

Alzheimer's & dementia : the journal of the Alzheimer's Association·2026
Same author

Lipopolysaccharide hydrolysis-targeting nano-chimeras detoxify endotoxin through specific adsorption and efficient degradation.

Nature communications·2026

Video Experimental Relacionado

Updated: Oct 3, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

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

13.6K

Estructuras agregadas de estructuras orgánicas covalentes bidimensionales

Chengjun Kang1, Zhaoqiang Zhang1, Adam K Usadi2

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585, Singapore.

Journal of the American Chemical Society
|February 14, 2022
PubMed
Resumen

Cuantificar las fases cristalinas en los marcos orgánicos covalentes 2D (COF) es un desafío. Este estudio utiliza resonancia magnética nuclear de estado sólido 13C (13C SSNMR) para revelar estructuras agregadas detalladas en COF, incluido el apilamiento de compensación no detectado anteriormente.

Más Videos Relacionados

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
05:26

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

Published on: February 10, 2023

2.9K
Synthesis and Characterization of Functionalized Metal-organic Frameworks
11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

48.4K

Videos de Experimentos Relacionados

Last Updated: Oct 3, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

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

13.6K
Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
05:26

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

Published on: February 10, 2023

2.9K
Synthesis and Characterization of Functionalized Metal-organic Frameworks
11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

48.4K

Área de la Ciencia:

  • Ciencias de los materiales
  • Química del estado sólido
  • Química supramolecular

Sus antecedentes:

  • Los marcos orgánicos covalentes (COF) exhiben diversas estructuras cristalinas, lo que permite una amplia gama de aplicaciones.
  • La cuantificación de las fases cristalinas en polvos de COF 2D policristalinos sigue siendo un desafío importante.
  • Comprender las estructuras agregadas de los FOC 2D es crucial para optimizar su rendimiento.

Objetivo del estudio:

  • Investigar las estructuras agregadas de las estructuras orgánicas covalentes 2D (COF).
  • Explorar la utilidad de la resonancia magnética nuclear de estado sólido 13C (13C SSNMR) para la caracterización de la agregación de COF.
  • Diferenciar entre los diferentes arreglos de apilamiento y su impacto en las propiedades de los FOC.

Principales métodos:

  • Se utilizó la espectroscopia de resonancia magnética nuclear de estado sólido (13C SSNMR).
  • Se analizaron cuatro muestras de COF 2D distintas, tanto en estado seco como solvado.
  • Cambios espectrales correlacionados con diferentes configuraciones de apilamiento de la capa de COF.

Principales resultados:

  • Demostrado que el 13C SSNMR puede distinguir efectivamente entre diferentes estructuras agregadas en los COF 2D.
  • Apilado AA diferenciado cuantitativamente de otros tipos de agregación.
  • Identificación de estructuras de apilamiento de desplazamiento no declaradas anteriormente en COFs 2D, no detectables por métodos de rayos X.
  • Se han observado estructuras agregadas distintas en los estados de COF secos frente a los solvados.

Conclusiones:

  • 13C SSNMR es una herramienta poderosa para el análisis cuantitativo de las estructuras agregadas de COF 2D.
  • El estudio revela nuevos conocimientos sobre el apilamiento de COF, incluidas las estructuras de desplazamiento ordenado de corto alcance.
  • Los hallazgos mejoran la comprensión de las estructuras 2D de COF y allanan el camino para un mejor diseño y aplicaciones de materiales.