Video Experimental Relacionado

Updated: Jun 29, 2026

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

Hidrogenación de N2 a partir de complejos de nitrógeno dinitrógeno de zirconio end-on bis(indenilo) activados

Doris Pun¹, Christopher A Bradley, Emil Lobkovsky

¹Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, USA.

Journal of the American Chemical Society

|October 2, 2008

Resumen

Los investigadores sintetizaron nuevos complejos de dinitrógeno y zirconoceno de extremo a extremo a través de la reducción de amalgama de sodio. Estos complejos se someten a hidrogenación para formar compuestos hidrido-zirconoceno-hidrazido, mostrando una nueva vía para la activación del dinitrógeno.

Área de la Ciencia:

Química organometálica Química orgánica de los metales.
Química Inorgánica La Química Inorgánica es la química inorgánica.
Coordinación Química de la Coordinación

Sus antecedentes:

Los complejos de dihaluro de bis ((indenilo) zirconio son precursores en la síntesis organometálica.
La activación y la funcionalización del dinitrógeno (N2) son desafíos clave en la química.
La comprensión de la unión metal-ligando es crucial para los procesos catalíticos.

Objetivo del estudio:

Para sintetizar y caracterizar nuevos complejos de dinitrógeno y zirconoceno.
Investigar las propiedades estructurales y electrónicas de estos complejos.
Para explorar la reactividad de los complejos de dinitrógeno hacia la hidrogenación.

Principales métodos:

Reducción de amalgama de sodio de complejos de dihaluro de bis ((indenilo) zirconio.
Cristalografía de rayos X para la determinación estructural.
Reacción de complejos de dinitrógeno con dihidrógeno para estudios de hidrogenación.

Principales resultados:

Síntesis de complejos de circonoceno de dinitrógeno de extremo con sal incluida.
El análisis estructural reveló enlaces cortos de Zr-N y enlaces alargados de N-N, lo que indica una activación de N2.
La hidrogenación condujo a los compuestos hidrido-zirconoceno-hidrazido y la eliminación de la sal.

Conclusiones:

Se ha establecido un nuevo tipo estructural del complejo de dinitrógeno de zirconoceno.
La coordinación de extremo a extremo del dinitrógeno es suficiente para la hidrogenación.
Este trabajo proporciona nuevos conocimientos sobre las vías de activación y funcionalización del dinitrógeno.

Más Videos Relacionados

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphos^Ph Complexes

Published on: April 10, 2015

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

Videos de Conceptos Relacionados

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

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 surface of...

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO₂ Mechanism

Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.