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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
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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.
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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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.
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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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Perturbación de la unidad de hidróxido de cobre a través de la variación estructural del ligando

Debanjan Dhar1, Gereon M Yee1, Andrew D Spaeth1

  • 1Department of Chemistry, Center for Metals in Biocatalysis, Chemical Theory Center, and Minnesota Supercomputing Institute, University of Minnesota , 207 Pleasant Street Southeast, Minneapolis, Minnesota 55455, United States.

Journal of the American Chemical Society
|December 24, 2015
PubMed
Resumen
Este resumen es generado por máquina.

Los nuevos complejos de cobre con ligandos modificados influyen en las reacciones de abstracción de átomos de hidrógeno (HAT). El ajuste electrónico impacta la termodinámica y la cinética, revelando una tendencia lineal entre la entalpía y la velocidad de reacción, con variaciones sutiles debido a las barreras y el túnel.

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Área de la Ciencia:

  • Química organometálica
  • Catálisis
  • Mecanismos de reacción

Sus antecedentes:

  • Los complejos de cobre son cruciales en la catálisis.
  • Comprender los efectos del ligando en la reactividad centrada en el metal es clave.
  • La abstracción de átomos de hidrógeno (HAT) es una vía de reacción fundamental.

Objetivo del estudio:

  • Para sintetizar y caracterizar nuevos complejos de hidróxido de cobre con propiedades electrónicas a medida.
  • Investigar los efectos termodinámicos y cinéticos de la modificación del ligando en las reacciones HAT.
  • Elucidar los factores que rigen la reactividad de las especies de hidróxido de cobre.

Principales métodos:

  • Síntesis de conjuntos nuevos de ligandos: (pipMe) LH2 y (NO2) LH2.
  • Medición de las energías de disociación de enlaces O-H (EDO) para los complejos Cu (II) -OH2.
  • Estudios cinéticos de las reacciones HAT por complejos de Cu (III) -hidróxido utilizando sustratos con diferentes fuerzas de enlace C-H.
  • Análisis de los efectos cinéticos de los isótopos (KIE) y cálculos de la teoría de los estados de transición.

Principales resultados:

  • La modificación del ligando dio lugar a diferencias modestas en las EDB para los bonos O-H.
  • Se observó una correlación lineal entre el logaritmo de la constante de velocidad de segundo orden (log k) y la entalpía de reacción (ΔH).
  • Las variaciones sutiles en las velocidades de reacción se atribuyeron a cambios en las alturas de la barrera HAT y las eficiencias de túneles cuánticos a bajas temperaturas (-80 a -20 °C).

Conclusiones:

  • El ajuste electrónico de los complejos de cobre a través del diseño del ligando tiene un impacto significativo en la termodinámica y cinética de la reacción HAT.
  • La tendencia lineal observada destaca el papel dominante de la entalpía de reacción, pero otros factores como el túnel también juegan un papel.
  • Este estudio proporciona información valiosa sobre el control de la reactividad de los complejos de hidróxido de cobre para aplicaciones catalíticas.