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

MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

14.5K
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...
14.5K
Valence Bond Theory and Hybridized Orbitals02:38

Valence Bond Theory and Hybridized Orbitals

31.9K
According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
31.9K
Polar Covalent Bonds02:24

Polar Covalent Bonds

31.0K
Covalent bonds are formed between two atoms when both have similar tendencies to attract electrons to themselves (i.e., when both atoms have identical or fairly similar ionization energies and electron affinities). Nonmetal atoms frequently form covalent bonds with other nonmetal atoms. For example, the hydrogen molecule, H2, contains a covalent bond between its two hydrogen atoms. When two separate hydrogen atoms with a particular potential energy approach each other, their valence orbitals...
31.0K
Valence Bond Theory02:42

Valence Bond Theory

11.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.4K
Valence Bond Theory02:45

Valence Bond Theory

50.9K
Overview of Valence Bond Theory
50.9K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.6K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.6K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

Building Molecules by a Self-Replicator That Catalyzes Acyl Hydrazone Formation.

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

A programmable modular robot for the synthesis of molecular machines.

Chem·2025
Same author

Covalent Dynamic DNA Networks to Translate Multiple Inputs into Programmable Outputs.

Journal of the American Chemical Society·2025
Same author

Competitive exclusion among self-replicating molecules curtails the tendency of chemistry to diversify.

Nature chemistry·2024
Same author

Simultaneous Formation of a Foldamer and a Self-Replicator by Out-of-Equilibrium Dynamic Covalent Chemistry.

Journal of the American Chemical Society·2024
Same author

Light-Mediated Interconversion between a Foldamer and a Self-Replicator.

Journal of the American Chemical Society·2024
Same journal

Gas-Responsive Metal-Organic Frameworks for Adaptive Thermal Energy Storage with Tunable Charge-Discharge Temperatures.

Journal of the American Chemical Society·2026
Same journal

Engineering a Thiamine-Dependent Benzoylformate Decarboxylase for Stereodivergent Radical C(sp<sup>3</sup>)-C(sp<sup>3</sup>) Bond Formation.

Journal of the American Chemical Society·2026
Same journal

Accelerated Directional Proton-Coupled Electron Transfer Enabled by Intrinsic Dipole Field in Biomimetic α-Helical Structure.

Journal of the American Chemical Society·2026
Same journal

Alternating Current-Driven Hydrogen Isotope Labeling of Aliphatic Amines Using 1,3-Propanedithiol as an Efficient Hydrogen Atom Transfer Reagent.

Journal of the American Chemical Society·2026
Same journal

Two-Dimensional van der Waals Polar Metal MoOBr<sub>2</sub>.

Journal of the American Chemical Society·2026
Same journal

Negatively Curved Chiral Bilayer Nanographene.

Journal of the American Chemical Society·2026
Ver todos los artículos relacionados

Video Experimental Relacionado

Updated: Mar 3, 2026

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

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

Published on: February 6, 2020

8.0K

Química Covalente Dinámica y Antiparalela

Bartosz M Matysiak1,2, Piotr Nowak1, Ivica Cvrtila1

  • 1Centre for Systems Chemistry, Stratingh Institute, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands.

Journal of the American Chemical Society
|April 26, 2017
PubMed
Resumen
Este resumen es generado por máquina.

Introducimos químicas antiparalelas, permitiendo el control de sistemas químicos complejos. Este enfoque utiliza el intercambio de tiol-disulfuro reversible y las reacciones de adición de tio-Michael para el control dinámico.

Más Videos Relacionados

Covalent Labeling with Diethylpyrocarbonate for Studying Protein Higher-Order Structure by Mass Spectrometry
10:36

Covalent Labeling with Diethylpyrocarbonate for Studying Protein Higher-Order Structure by Mass Spectrometry

Published on: June 15, 2021

6.1K
Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
06:17

Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay

Published on: February 28, 2025

1.3K

Videos de Experimentos Relacionados

Last Updated: Mar 3, 2026

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

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

Published on: February 6, 2020

8.0K
Covalent Labeling with Diethylpyrocarbonate for Studying Protein Higher-Order Structure by Mass Spectrometry
10:36

Covalent Labeling with Diethylpyrocarbonate for Studying Protein Higher-Order Structure by Mass Spectrometry

Published on: June 15, 2021

6.1K
Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
06:17

Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay

Published on: February 28, 2025

1.3K

Área de la Ciencia:

  • Sistemas químicos
  • Química supramolecular
  • Química orgánica

Sus antecedentes:

  • El diseño de sistemas químicos funcionales complejos requiere redes de reacción controlables.
  • La química combinatoria dinámica ofrece complejidad pero carece de un control preciso.
  • La química de sistemas avanzados exige métodos para generar y abordar la complejidad.

Objetivo del estudio:

  • Introducir químicas antiparalelas para la complejidad controlable en los sistemas químicos.
  • Demostrar un cambio de sistema entre el intercambio de tiol-disulfuro y la adición de tio-Michael.
  • Proporcionar una plataforma versátil para el desarrollo de sistemas químicos funcionales avanzados.

Principales métodos:

  • Química antiparalela utilizada: intercambio de tiol-disulfuro y adición de tio-Michael.
  • Utilizó un bloque de construcción de tiol común para ambas sustancias químicas reversibles.
  • Controlado el estado del sistema a través de parámetros de oxidación y reducción.

Principales resultados:

  • Se ha logrado un cambio reversible entre la adición de tio-Michael y la formación de disulfuro.
  • Control demostrado sobre el grado de cada química a través del potencial redox.
  • Mostró el funcionamiento del sistema en medios acuosos a temperatura ambiente y pH suave.

Conclusiones:

  • Las químicas antiparalelas ofrecen una nueva estrategia para diseñar sistemas químicos complejos direccionables.
  • El sistema basado en tiol proporciona una plataforma robusta para el desarrollo de la química de sistemas.
  • Este enfoque facilita la creación de materiales funcionales dinámicos y dispositivos moleculares.