Video Experimental Relacionado
Updated: May 17, 2026
06:31
Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase
Published on: March 19, 2020
Los complejos NCN pinza-Pt están coordinados por el anión radical (nitróxido de nitronio)-2-ido
Xun Zhang1, Shuichi Suzuki, Masatoshi Kozaki
1Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.
Journal of the American Chemical Society
|October 19, 2012
Resumen
Se sintetizaron nuevos complejos de platino (Pt) con un anión radical de nitróxido de nitronilo. La coordinación con el platino cambió el anión radical.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Coordinación Química de la Coordinación
- Química Radical La Química Radical es una ciencia
Sus antecedentes:
- Los ligandos de pinza ofrecen entornos de coordinación únicos para los centros metálicos.
- Los radicales de nitróxido de nitronilo son versátiles bloques de construcción paramagnéticos.
- Los complejos de platino tienen diversas aplicaciones en catálisis y medicina.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos complejos de pinza y platino que incorporan un anión radical de nitróxido de nitronila.
- Para investigar los efectos estructurales y electrónicos de la coordinación del anión radical a un centro de platino.
- Para determinar el impacto de la coordinación del platino en las propiedades redox de la fracción de nitróxido de nitronilo.
Principales métodos:
- Síntesis de complejos pinza-Pt a través de procedimientos organometálicos establecidos.
- Elucidación estructural utilizando difracción de rayos X de un solo cristal.
- Caracterización espectroscópica que incluye espectroscopia de RMN y EPR.
- Estudios electroquímicos para determinar los potenciales de oxidación.
Principales resultados:
- Se prepararon complejos estables de pinza-Pt con el anión radical nitróxido de nitronilo en altos rendimientos.
- Se confirmaron inequívocamente las estructuras de los complejos Pt neutrales y oxidados.
- La coordinación a Pt(II) dio como resultado un cambio negativo significativo de aproximadamente 0.6 V en el potencial de oxidación del nitróxido de nitronilo.
Conclusiones:
- La síntesis y caracterización exitosas de estos nuevos complejos demuestran la viabilidad de incorporar aniones radicales en estructuras de pinza y platino.
- El desplazamiento negativo observado en el potencial de oxidación resalta la influencia electrónica del centro de platino en el radical coordinado.
- Estos hallazgos abren vías para explorar la actividad redox y las posibles aplicaciones de tales complejos paramagnéticos de platino.
Más Videos Relacionados
Videos de Conceptos Relacionados
02:54Coordination Compounds and Nomenclature
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
02:34Structural Isomerism
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 be...
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 be...
02:57Coordination Number and Geometry
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
02:42Valence Bond Theory
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...
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...
01:15Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...