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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Valence Bond Theory02:42

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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...
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Structural Isomerism02:34

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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,...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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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.
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Aislamiento de un complejo de (dinitrógeno) tri-cobre (I)

Leslie J Murray1, Walter W Weare, Jason Shearer

  • 1Department of Chemistry, Center for Catalysis, University of Florida , Gainesville, Florida 32611, United States.

Journal of the American Chemical Society
|September 20, 2014
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores sintetizaron un complejo de tricopero (I) con un ligando de dinitrógeno puente. Los análisis espectroscópicos y computacionales revelaron una mínima unión de retorno metal-nitrógeno, lo que sugiere una interacción electrónica única.

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Área de la Ciencia:

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

Sus antecedentes:

  • Los ciclofanos tris ((β-diketimina) son ligandos versátiles en la química de la coordinación.
  • Los ligandos de dinitrógeno (N2) son difíciles de sintetizar y estudiar debido a su inercia.
  • Los complejos de cobre con ligandos N2 ofrecen potencial para aplicaciones catalíticas.

Objetivo del estudio:

  • Síntesis y caracterización de un nuevo complejo de tricópero (I) con un ligando dinitrógeno puente.
  • Para investigar la estructura electrónica y las interacciones de enlace entre el cobre y el ligando de dinitrógeno.
  • Para explorar la naturaleza de la unión de retorno metal-nitrógeno utilizando métodos computacionales.

Principales métodos:

  • Síntesis de un complejo de tricópero (I) a partir de un precursor de ciclófano de tris (β-diketimina).
  • Caracterización mediante espectroscopia de Raman (rRaman) y espectroscopia de resonancia magnética nuclear (RMN) con nitrógeno-15.
  • Cálculos de la Teoría Funcional de Densidad (DFT) y análisis de la Teoría Cuántica de los Átomos en las Moléculas (QTAIM).

Principales resultados:

  • Se sintetizó con éxito un complejo de tricópero (I) con un ligando de dinitrógeno puente.
  • Los datos espectroscópicos (rRaman νN-N = 1952 cm(-1), (15) NMR δ = 303,8 ppm) confirmaron la presencia del ligando de dinitrógeno.
  • Los análisis de DFT y QTAIM indicaron un vínculo de retroceso mínimo entre el metal y el dinitrógeno, con una contribución limitada de los orbitales N2 ((2pπ*) y Cu ((3dπ) / Cu ((3dσ)).

Conclusiones:

  • El estudio informa de la formación de un complejo único de tricopero (I) -dinitrogeno.
  • La estructura electrónica revela interacciones débiles entre metal y dinitrógeno, distintas de los típicos escenarios de enlace.
  • Los hallazgos contribuyen a comprender la química de coordinación del dinitrógeno con los metales de transición.