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Formation of Complex Ions03:45

Formation of Complex Ions

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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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Metal-Ligand Bonds02:51

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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.
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...
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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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Precipitation Gravimetry01:03

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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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...
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Descubrimiento de complejos de Ni para la inserción de CO2 habilitado por una secuencia de selección de aprendizaje

Julian A Hueffel1, Mathilde Rigoulet1, Sebastian Wellig1

  • 1Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.

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El aprendizaje automático y las predicciones computacionales identifican los ligandos que controlan los estados de oxidación del catalizador de níquel para la inserción eficiente de CO2. Este enfoque guía la selección de ligandos, mejorando el diseño y la reactividad del catalizador.

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Área de la Ciencia:

  • Catálisis
  • Química computacional
  • Ciencias de los materiales

Sus antecedentes:

  • La especiación del catalizador es crucial para la eficiencia, la reactividad y la selectividad.
  • La comprensión de los factores que dictan la especiación del catalizador es limitada, a menudo dependiendo del ensayo y el error.
  • Se necesitan herramientas predictivas para la selección de ligandos para controlar la especiación metálica.

Objetivo del estudio:

  • Evaluar el aprendizaje automático combinado con predicciones de barrera de activación computacional para guiar la selección de ligandos.
  • Para lograr la inserción de CO2 a temperatura ambiente para los complejos Ni (I) -Ph vulnerables.
  • Identificar los ligandos que favorecen el estado de oxidación de Ni (I) para una mayor reactividad.

Principales métodos:

  • Racionalización computacional de la reactividad de Ni (I) frente a Ni (II) hacia la inserción de CO2.
  • Construcción de una base de datos de descriptores in silico para el aprendizaje automático.
  • Predicción de aprendizaje automático de los ligandos que favorecen el estado de oxidación de Ni (I), filtrado por barreras de activación.
  • Síntesis y ensayo experimental de los ligandos previstos para la inserción de CO2.

Principales resultados:

  • Se han identificado ligandos que favorecen el intermediario reactivo Ni (I) -Ph.
  • Reactividad prevista y confirmada a temperatura ambiente para la inserción de CO2.
  • Alineación demostrada entre las predicciones computacionales y los resultados experimentales.

Conclusiones:

  • El aprendizaje automático y la química computacional ofrecen un plan para predecir los ligandos que controlan el estado de oxidación y la reactividad de los complejos metálicos.
  • Este enfoque puede guiar el diseño de ligandos para las transformaciones catalíticas deseadas.
  • Permite la predicción de los ligandos, incluidos los nuevos, para el rendimiento del catalizador objetivo.