Video Experimental Relacionado
Updated: Jul 8, 2026
07:02
The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
Published on: August 25, 2016
Formación de nitruro por termólisis de un complejo dinitrógeno de niobio cinéticamente estable
Michael D Fryzuk1, Christopher M Kozak, Michael R Bowdridge
1Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada. fryzuk@chem.ubc.ca
Journal of the American Chemical Society
|July 11, 2002
Resumen
Este estudio introduce un nuevo complejo de niobio paramagnético dinuclear dinitrógeno dinuclear. Este complejo se somete a termólisis para formar un nitruro puente y reacciona con los alquinos para producir complejos paramagnéticos alquinos, mostrando niobio.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química del niobio
Sus antecedentes:
- La síntesis y caracterización de nuevos complejos de metales de transición son cruciales para comprender los enlaces químicos y la reactividad.
- Los complejos de niobio, particularmente aquellos con ligandos de dinitrógeno, ofrecen oportunidades únicas para explorar la fijación del nitrógeno y las transformaciones catalíticas.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo paramagnético dinuclear dinitrógeno dinuclear niobio complejo.
- Investigar la reactividad de este complejo hacia la termólisis y la inserción de alquinos.
- Para explorar las propiedades electrónicas y magnéticas de los complejos de niobio resultantes.
Principales métodos:
- Síntesis del complejo de niobio de dinitrógeno dinuclear ([P(2) N(2)]Nb) ((2) (((mu-N(2)) a través de la reducción de [P(2) N(2)]NbCl con KC(8).
- Caracterización mediante cristalografía de rayos X, espectroscopia EPR y mediciones de susceptibilidad magnética a temperatura variable.
- Cálculos de la teoría funcional de la densidad (DFT) en un modelo complejo.
- Termolisis y reacción con fenilacetileno para formar nuevos complejos de niobio.
Principales resultados:
- Se sintetizó y caracterizó con éxito el complejo paramagnético de niobio de dinitrógeno dinuclear ([P(2) N(2)]Nb) ((2) mu-N(2)).
- Se observó un acoplamiento antiferromagnético entre los dos centros de Nb (IV) en el complejo de dinitrógeno.
- La termólisis produjo una especie de nitruro puente paramagnético, [P(2) N(2)]Nb(mu-N) Nb[PN(3)].
- La reacción con el fenilacetileno produjo un complejo paramagnético eta(2)-alquina, [P(2) N(2)]Nb(eta(2)-HCCPh).
Conclusiones:
- El estudio demuestra la síntesis y caracterización exitosas de nuevos complejos paramagnéticos de niobio con ligandos de nitrógeno y alquino.
- El acoplamiento antiferromagnético observado proporciona información sobre la estructura electrónica de los centros dinucleares de niobio.
- Los estudios de reactividad ponen de relieve el potencial de estos complejos de niobio en las reacciones de transferencia de átomos de nitrógeno y funcionalización de alquinos.
Videos de Conceptos Relacionados
01:19Chemical Reactions
A chemical reaction is a process by which the bonds in the atoms of substances are rearranged to generate new substances. Matter cannot be created or destroyed in a chemical reaction—the same type and number of atoms that make up the reactants are still present in the products. Merely, the rearrangement of chemical bonds produces new compounds.
Chemical Reactions Rearrange Atoms into New Substances
A chemical reaction takes starting materials—the reactants—and changes them into different...
Chemical Reactions Rearrange Atoms into New Substances
A chemical reaction takes starting materials—the reactants—and changes them into different...
02:39Phase Transitions: Melting and Freezing
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
02:39Enthalpy of Solution
There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
02:34Polymers
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
02:26Chemical Reactions
A balanced chemical equation provides the information of chemical formulas of the reactants and products involved in the chemical change. A reaction’s stoichiometry helps predict how much of the reactant is needed to produce the desired amount of product, or in some cases, how much product will be formed from a specific amount of the reactant.
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in...
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in...
00:54Radical Formation: Homolysis
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.