Video Experimental Relacionado
Updated: Jul 26, 2025
10:21
Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
8.4K
Reacción de evolución de hidrógeno impulsada por la luz catalizada por una hidrogenasa artificial de molibdeno y
Raphaël J Labidi1, Bruno Faivre1, Philippe Carpentier2
1Laboratoire de Chimie des Processus Biologiques, UMR 8229, Collège de France/CNRS/Sorbonne Université, 11 place Marcellin-Berthelot, 75231 Paris, France.
Journal of the American Chemical Society
|June 12, 2023
Resumen
La proteína naranja (Orp) con un grupo único de molibdeno / cobre cataliza la producción de hidrógeno a partir de protones. Las variantes modificadas de Orp, especialmente Mo/Fe-Orp, muestran una eficiencia récord como hidrogenasas artificiales bajo luz visible.
Área de la Ciencia:
- La bioquímica
- Química bioorgánica
- Fotocatálisis
Sus antecedentes:
- La proteína naranja (Orp) es una metaloproteína bacteriana con un grupo heterometálico único de función desconocida.
- Las metaloproteínas ofrecen potencial para nuevas aplicaciones catalíticas debido a sus sitios activos intrincados.
Objetivo del estudio:
- Investigar la actividad fotocatalítica de la proteína naranja (Orp) para la evolución del hidrógeno.
- Caracterizar el grupo heterometálico de molibdeno/cobre (Mo/Cu) dentro de Orp y explorar su mecanismo catalítico.
- Diseñar y evaluar variantes modificadas de Orp para mejorar la producción de hidrógeno.
Principales métodos:
- Caracterización bioquímica y espectroscópica del holo-Orp.
- Simulaciones de acoplamiento y dinámica molecular para identificar el sitio activo.
- Experimentos de evolución del hidrógeno fotocatalítico utilizando ascorbato y un fotosensibilizador.
- Cálculos de la teoría funcional de la densidad (DFT) para dilucidar el mecanismo de reacción.
- Montaje y ensayo de varios grupos de metales dinucleares (M/M'-Orp) dentro del andamio Orp.
Principales resultados:
- Holo-Orp que contiene el grupo [S2MoS2CuS2MoS2]3 demostró una actividad fotocatalítica significativa para la evolución del hidrógeno.
- Se logró un número máximo de rotación (TON) de 890 con holo-Orp después de 4 horas de irradiación.
- Los cálculos de DFT propusieron un mecanismo que involucraba átomos terminales de azufre en la formación de H2.
- Las variantes de ingeniería Mo/Fe-Orp exhibieron una notable TON de 1150 y una frecuencia de rotación inicial (TOF°) de 800 h-1, estableciendo un nuevo récord para las hidrogenasas artificiales.
Conclusiones:
- La proteína naranja (Orp) es un fotocatalizador eficaz para la evolución del hidrógeno.
- El clúster único de Mo/Cu y los residuos específicos de aminoácidos en Orp son cruciales para su actividad catalítica.
- Las variantes de Orp diseñadas, en particular Mo/Fe-Orp, representan hidrogenasas artificiales altamente eficientes con potencial para la producción sostenible de hidrógeno.
Videos de Conceptos Relacionados
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.2K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.2K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.4K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.4K
02:50Catalysis
27.1K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
27.1K
00:26Hydrogen Bonds
121.5K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
121.5K
01:32Chemiosmosis
100.1K
Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
100.1K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.4K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.4K