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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.
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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 the dxy,...
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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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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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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Los dicianometalatos como modelos de estructuras extendidas

Joshua A Hill1, Amber L Thompson1, Andrew L Goodwin1

  • 1Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QR, U.K.

Journal of the American Chemical Society
|April 9, 2016
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores detallaron ocho nuevos marcos de dicyanometallato con cationes orgánicos, que ofrecen información sobre materiales híbridos inorgánicos y orgánicos. La diversidad estructural surge de los nodos metálicos y las propiedades de los cationes, lo que ayuda a la exploración del marco.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química inorgánica
  • La cristalografía

Sus antecedentes:

  • Los dicianometalatos son polímeros de coordinación con aplicaciones potenciales en la ciencia de los materiales.
  • Comprender los factores que rigen su diversidad estructural es crucial para el diseño de nuevos materiales.

Objetivo del estudio:

  • Informar sobre las estructuras de ocho nuevas estructuras de dicianometalato.
  • Racionalizar la diversidad estructural de los dicianometalatos sobre la base de componentes de marco y extra-marco.

Principales métodos:

  • Se utilizó la difracción de rayos X de un solo cristal para determinar las estructuras de los nuevos marcos de dicyanometallato.
  • Análisis comparativo de estructuras conocidas y nuevas para identificar los principios que dirigen la estructura.

Principales resultados:

  • Se sintetizaron y caracterizaron estructuralmente ocho nuevas estructuras de dicyanometallato que contienen cationes moleculares extraestructurales.
  • El estudio identificó las propiedades del catión metálico (carga, coordinación) y las características del catión extra-marco (tamaño, forma) como factores clave que controlan la topología del marco.
  • Estos nuevos materiales representan análogos híbridos inorgánicos de las fases cerámicas establecidas como Ruddlesden-Popper y las perovskitas.

Conclusiones:

  • Los dicianometalatos ofrecen una plataforma versátil para crear diversos marcos extendidos.
  • La interacción entre los nodos marco y los nodos extra marco dicta los resultados estructurales.
  • Esta clase de materiales sirve como un excelente modelo para estudiar las relaciones estructura-propiedad en marcos extendidos.