Video Experimental Relacionado
Updated: Apr 11, 2026
10:51
The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
12.9K
Complejos de diirón puenteado-tiolato que se unen al N2 en los estados redox Fe (II) Fe (II), Fe (II) Fe (I) y Fe (I)
Sidney E Creutz1, Jonas C Peters1
1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.
Journal of the American Chemical Society
|June 4, 2015
Resumen
Los investigadores desarrollaron nuevos complejos de diirón que se unen y reducen el gas nitrógeno (N2) al amoníaco (NH3). Estos modelos ricos en azufre avanzan en la comprensión de la fijación de nitrógeno mediada por el hierro.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química organometálica Química orgánica de los metales.
- Química biomimética es una química biomimética.
Sus antecedentes:
- Los cofactores de la nitrogenasa, esenciales para la fijación biológica del nitrógeno, contienen hierro y azufre, pero los modelos sintéticos son raros.
- Comprender el mecanismo de fijación del nitrógeno requiere complejos sintéticos bien definidos que imiten los sistemas biológicos.
Objetivo del estudio:
- Síntesis y caracterización de nuevos complejos de diironio de baja valencia capaces de unirse al dinitrógeno (N2).
- Investigar la reactividad de estos complejos, incluyendo la reducción de N2 y la catálisis.
- Desarrollar nuevos andamios de ligandos para apoyar los grupos de hierro-azufre involucrados en la fijación del nitrógeno.
Principales métodos:
- Síntesis de un nuevo andamio de ligando binucleante para soportar complejos de diirón.
- Coordinación del dinitrógeno (N2) con la subunidad Fe (μ-SAr) Fe a través de múltiples estados de oxidación.
- Caracterización espectroscópica y electroquímica de los complejos resultantes.
Principales resultados:
- Se sintetizó con éxito una serie de complejos de diirón de baja valencia con ligandos de tiolato y dinitrógeno.
- El sistema (N2-Fe(μ-SAr)Fe-N2) demostró la reducción de N2 a amoníaco (NH3) con un rendimiento de aproximadamente el 50%.
- El sistema catalizó eficientemente la desproporción de hidrazina (N2H4) a NH3 y N2, y apoyó la unión de coligando con hidruro.
Conclusiones:
- El andamio desarrollado proporciona una plataforma versátil para estudiar la fijación de nitrógeno mediada por el hierro.
- Estos modelos sintéticos ofrecen información sobre los pasos fundamentales de la reducción y fijación de nitrógeno.
- Los hallazgos contribuyen al diseño de futuros catalizadores para la fijación artificial de nitrógeno.
Videos de Conceptos Relacionados
02:51Metal-Ligand Bonds
25.7K
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...
25.7K
02:34Structural Isomerism
22.5K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
22.5K
01:19Complexation Equilibria: The Chelate Effect
1.6K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.6K
03:02Colors and Magnetism
14.7K
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...
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...
14.7K
02:42Valence Bond Theory
11.7K
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...
11.7K
03:45Formation of Complex Ions
26.9K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
26.9K