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

Valence Bond Theory02:42

Valence Bond Theory

11.1K
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...
11.1K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

23.9K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
23.9K
Ferromagnetism01:31

Ferromagnetism

2.9K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.9K
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

5.6K
Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
5.6K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.6K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.6K
Colors and Magnetism03:02

Colors and Magnetism

13.9K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
13.9K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

Nickel and platinum modified exfoliated carbon nitride as photo-thermal catalysts for CO<sub>2</sub> hydrogenation.

Dalton transactions (Cambridge, England : 2003)·2026
Same author

A superconducting transition edge sensor array for synchrotron soft x-ray emission spectroscopies of low-dimensional and impurity-level concentration systems.

The Review of scientific instruments·2026
Same author

Spotlight on the Nucleotide: Solid-State NMR for the Investigation of ATP Hydrolysis in the ATPase SmsC.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same author

Mapping Molecular/Nanocrystal Orientation with Nano-FTIR.

The journal of physical chemistry letters·2026
Same author

A Structurally Authenticated Closed-Shell Iron(IV) Oxo Ferryl Complex: Synthesis, Properties, and Reactivity.

Journal of the American Chemical Society·2026
Same author

Antifluorite-derived Li<sub>7</sub>MnN<sub>4</sub>: revisiting the crystal structure and catalysis in ammonia decomposition.

Catalysis science & technology·2026

Video Experimental Relacionado

Updated: Jan 10, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

4.6K

Conjunto de hierro y azufre que contiene metilo con geometría FeMoco

Anna G Scott1,2, Serena DeBeer2, Theodor Agapie1

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.

Journal of the American Chemical Society
|November 24, 2025
PubMed
Resumen

Los investigadores sintetizaron nuevos grupos de hierro y azufre con ligandos de metilo, imitando la fijación biológica del nitrógeno. Estos grupos exhiben altos estados de espín y propiedades electrónicas únicas, que ofrecen información sobre los mecanismos de la enzima nitrogenasa.

Más Videos Relacionados

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
07:56

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron

Published on: August 12, 2019

8.3K
EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1
06:01

EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1

Published on: November 26, 2014

13.8K

Videos de Experimentos Relacionados

Last Updated: Jan 10, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

4.6K
Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
07:56

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron

Published on: August 12, 2019

8.3K
EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1
06:01

EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1

Published on: November 26, 2014

13.8K

Área de la Ciencia:

  • Química bioorgánica
  • Química organometálica
  • La bioquímica

Sus antecedentes:

  • Las nitrogenasas catalizan la producción de amoníaco a partir del gas nitrógeno utilizando grupos de metales complejos.
  • Un ligando de carburo, derivado de un grupo metilo, es crucial en el grupo octanuclear de las nitrogenasas.
  • Es esencial comprender el papel de los ligandos alquilo en la reactividad del clúster metal-azufre.

Objetivo del estudio:

  • Para sintetizar y caracterizar los grupos de hierro-azufre con ligandos metilo terminales y puentes.
  • Investigar el impacto de los ligandos alquilo en la estructura electrónica y los estados de espín de los grupos MFeS.
  • Para explorar la reactividad de estos grupos sintéticos en las transformaciones mediadas por ácido.

Principales métodos:

  • Síntesis de grupos octanucleares de molibdeno-hierro-azufre (MoFeS) mediante el uso de reactivos de metil Grignard.
  • Caracterización espectroscópica (por ejemplo, RMN, EPR) de los racimos sintetizados.
  • Análisis computacional para determinar la estructura electrónica y el enlace.

Principales resultados:

  • Formación de un grupo de MoFeS octanuclear de alto espín con ligandos metilo puentes.
  • Observación de altos estados de espín en grupos de MFeS con centros de hierro de baja valencia, atribuidos a las interacciones ferromagnéticas Fe-Fe.
  • Demostración de la formación de hidrógeno y metano tras el tratamiento con ácido de los racimos sintetizados.

Conclusiones:

  • Los ligandos alquilo, en particular los grupos metilo, se pueden incorporar a los grupos MFeS, lo que influye en sus propiedades electrónicas.
  • Las interacciones ferromagnéticas entre los centros de hierro de baja valencia son clave para lograr altos estados de espín en estos grupos.
  • Los grupos sintéticos de MFeS con ligandos alquilo proporcionan modelos valiosos para comprender la función y la reactividad de la nitrogenasa.