Video Experimental Relacionado
Updated: Jun 21, 2026
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
07:12
Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Síntesis y estudios espectroscópicos sobre derivados de colorantes azoicos de complejos polimetales de lantánidos:
Matteo P Placidi1, Aaron Joseph L Villaraza, Louise S Natrajan
1School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Journal of the American Chemical Society
|July 8, 2009
Resumen
Se sintetizaron nuevos complejos de lantánidos tetrametales heteronucleares utilizando diazotización y formación de compuestos azoicos. La espectroscopia de luminiscencia confirmó la estabilidad de los complejos precursores durante la síntesis.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Coordinación Química de la Coordinación
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los complejos de lantánidos son cruciales en varias aplicaciones debido a sus propiedades luminiscentes únicas.
- El desarrollo de nuevos complejos metálicos heteronucleares ofrece oportunidades para las características de los materiales a medida.
- Los métodos de síntesis anteriores no siempre pueden preservar la integridad de los bloques de construcción complejos.
Objetivo del estudio:
- Para sintetizar nuevos complejos de lantánidos tetrametales tetrametales heteronucleares.
- Para investigar la estabilidad de los complejos precursores en condiciones de reacción.
- Establecer una ruta sintética confiable para ensamblajes complejos de lantánidos.
Principales métodos:
- Síntesis de complejos de lantánidos tetrametales heteronucleares.
- Utilizando la diazotización y la formación de compuestos azoicos como pasos sintéticos clave.
- Empleando espectroscopia de luminiscencia para evaluar la estabilidad compleja.
Principales resultados:
- Síntesis exitosa de complejos de lantánidos tetrametales heteronucleares.
- Demostración de la estabilidad del complejo precursor a lo largo del proceso de síntesis.
- Caracterización de los complejos lantánidos resultantes.
Conclusiones:
- El método sintético desarrollado es eficaz para crear complejos de lantánidos tetrametales tetrametales heteronucleares.
- La estabilidad de los bloques de construcción garantiza la integridad de las estructuras complejas finales.
- Este trabajo proporciona una base para una mayor exploración de materiales basados en lantánidos.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
01:20Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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.
01:19Diazonium 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.
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...
00:39Complexometric Titration: Overview
Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free indicator. The...