Video Experimental Relacionado
Updated: Jul 29, 2026
![[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
09:12
[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
Published on: May 21, 2019
Caracterización de las imidas terminales de hierro (IV) (PhBP) (t) (Bu) (pz) (Fe) (IV) (NAd) +
Christine M Thomas1, Neal P Mankad, Jonas C Peters
1Division of Chemistry and Chemical Engineering, Arnold and Mabel Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, USA.
Journal of the American Chemical Society
|April 13, 2006
Resumen
Nuevos ligandos trípodos estabilizan complejos de hierro de alta valencia, incluido un único catión de imida de hierro (IV). Estos hallazgos avanzan en la comprensión de la química de coordinación del hierro y la reactividad.
Área de la Ciencia:
- Coordinación Química de la Coordinación
- Química organometálica Química orgánica de los metales.
- Química Inorgánica La química inorgánica es la química inorgánica.
Sus antecedentes:
- Los complejos de hierro son cruciales en varios procesos catalíticos.
- Estabilizar los estados de alta oxidación en el hierro es un desafío.
- El desarrollo de nuevos ligandos es clave para acceder a la reactividad única del hierro.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos híbridos de bis ((fosfina) ((pirazol) borato ligandos trípodos.
- Para explorar la química de coordinación de estos ligandos con el hierro a través de múltiples estados de oxidación.
- Investigar la estabilización y caracterización de especies de hierro de alta valencia, en particular el Fe (IV).
Principales métodos:
- Síntesis y caracterización de ligandos.
- Estudios de complejación y redox del hierro.
- Espectroscópico (RMN, UV-Vis, etc.) para el estudio de la luz. y análisis electroquímico.
- Cristalografía de rayos X para la determinación estructural.
Principales resultados:
- Se ha logrado la síntesis de [PhBPtBu2(pz') ]-ligandos.
- Demostración del soporte de ligandos para el hierro pseudotetraédrico en los estados de oxidación +1, +2, +3 y +4.
- Estabilización de estados de oxidación más altos a través de un enlace FeNR terminal.
- Generación y caracterización de un catión de imida S = 1 Fe ((IV) NR +, incluida su estructura cristalina.
Conclusiones:
- Los nuevos ligandos [PhBPtBu2(pz') - estabilizan eficazmente una amplia gama de estados de oxidación del hierro.
- El catión de imida Fe (IV) representa un avance significativo en la química del hierro de alta valencia.
- Este sistema de ligandos ofrece una plataforma para futuros estudios en catálisis y reactividad del hierro.
Más Videos Relacionados
11:04Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
Published on: September 7, 2019
06:31Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase
Published on: March 19, 2020
Videos de Conceptos Relacionados
02:54Coordination Compounds and Nomenclature
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
02:51Metal-Ligand Bonds
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...
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...
02:42Valence Bond Theory
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...
03:02Colors and Magnetism
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 eye.
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 eye.
01:25Basicity of Heterocyclic Aromatic Amines
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
01:07Ladder Diagrams: Complexation Equilibria
Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...