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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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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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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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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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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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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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Dos bastidores de vanadogermanato sustituidos por tetra-Cd(II) se encuentran en el marco.

Jian Zhou1, Jun-Wei Zhao, Qi Wei

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou, Fujian 350002, China.

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

Se sintetizaron dos nuevos marcos 3D de vanadogermanato con sustitución de cadmio. Estas únicas estructuras híbridas orgánico-inorgánico exhiben cáscaras de racimo sin precedentes y revelan acoplamiento antiferromagnético en los centros de vanadio.

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Área de la Ciencia:

  • Química Inorgánica La Química Inorgánica es la química inorgánica.
  • Ciencia de los materiales Ciencia de los materiales.
  • Ingeniería de Cristal Ingeniería de Cristal.

Sus antecedentes:

  • Los vanadogermanatos son una clase emergente de materiales inorgánicos con diversas estructuras y propiedades.
  • El desarrollo de nuevos marcos 3D que incorporen metales de transición y enlaces orgánicos es crucial para el diseño de materiales avanzados.

Objetivo del estudio:

  • Para sintetizar y caracterizar nuevas estructuras de vanadogermanato sustituidas por tetra-cadmio.
  • Para aclarar las características estructurales únicas y unidades de construcción de estos nuevos materiales.
  • Para investigar las propiedades magnéticas que surgen de los centros de metales de transición.

Principales métodos:

  • La síntesis hidrotermal es una síntesis hidrotermal.
  • Un solo cristal de difracción de rayos X de un solo cristal.
  • La espectroscopia infrarroja es una espectroscopia de infrarrojos.
  • El análisis elemental es el análisis elemental.
  • Difracción de rayos X en polvo (PXRD)
  • Espectroscopia de rayos X dispersiva de energía (EDX)
  • Espectroscopia de fotoelectrones de rayos X (XPS, por sus siglas en inglés)
  • El análisis termogravimétrico (TGA)
  • Mediciones magnéticas de las mediciones.

Principales resultados:

  • Se han sintetizado con éxito dos estructuras de vanadogermanato 3D isomórficas, {(CdX) 4Ge8V ((IV) 10O46 ((H2O) [V ((III) ((H2O) ]2]4 ((GeO2) 4}·8H2O (X = etilendiamina (en, 1) y 1,2-diaminopropano (dap, 2)).
  • Estos marcos presentan estructuras híbridas orgánicas-inorgánicas en 3D sin precedentes construidas a partir de grandes capas de racimos de vanadogermanato sustituidas por metales de transición y unidas por tetraedros germanados y raros racimos V (III).
  • Los estudios magnéticos indicaron acoplamientos antiferromagnéticos entre los centros de vanadio dentro de los marcos.

Conclusiones:

  • La síntesis exitosa de estos complejos marcos de vanadogermanato expande la biblioteca de materiales híbridos inorgánicos-orgánicos conocidos.
  • Los motivos estructurales únicos y la presencia de múltiples estados de oxidación de los metales de transición ofrecen potencial para una mayor funcionalización y aplicación.
  • El comportamiento antiferromagnético observado proporciona información sobre las interacciones magnéticas dentro de estos nuevos materiales.