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Coordination Number and Geometry02:57

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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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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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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Imagine taking a large number of identical...
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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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Las jaulas de coordinación cúbicas octanucleares.

Ian S Tidmarsh1, Thomas B Faust, Harry Adams

  • 1Department of Chemistry, University of Sheffield, UK.

Journal of the American Chemical Society
|October 16, 2008
PubMed
Resumen
Este resumen es generado por máquina.

Dos nuevos ligandos puentes bis-bidentados, L-naph y L-anth, forman jaulas supramoleculares cúbicas con metales de transición. Las jaulas L ((naph) exhiben una mayor estabilidad en disolventes polares debido a las interacciones de apilamiento de pi, a diferencia de las jaulas L ((anth).

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Coordinación Química de la Coordinación
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Desarrollo de nuevos ligandos para construir complejas arquitecturas supramoleculares.
  • Investigación de las interacciones metal-ligando en jaulas autoensambladas.
  • Comprender la influencia de la estructura del ligando en las propiedades y la estabilidad de la jaula.

Objetivo del estudio:

  • Síntesis y caracterización de nuevos ligandos puente bis-bidentado, L (naph) y L (anth).
  • Explorar el autoensamblaje de jaulas supramoleculares usando estos ligandos y varios metales de transición.
  • Investigar las diferencias estructurales y la estabilidad de las jaulas formadas con L (naph) versus L (anth) ligandos.

Principales métodos:

  • Síntesis y caracterización de ligandos.
  • Cristalografía de rayos X para la determinación estructural de las jaulas supramoleculares.
  • Técnicas espectroscópicas (NMR, fluorescencia) para estudiar las propiedades de la jaula y la estabilidad en solución.
  • Análisis de la coordinación metal-ligando y las interacciones intermoleculares.

Principales resultados:

  • Síntesis exitosa de los ligandos L (naph) y L (anth).
  • Formación de jaulas cúbicas con metales de transición (Cu, Zn, Co, Ni, Cd).
  • La aclaración estructural reveló arquitecturas distintas: jaulas L (anth) con caras helicoidales, jaulas L (naph) con simetría S6 y apilamiento de pi periférico.
  • Las jaulas L ((naph) demostraron una estabilidad superior en disolventes polares en comparación con las jaulas L ((anth) debido al apilamiento aromático.
  • Los estudios de fluorescencia de las jaulas de Cd-L ((naph) mostraron la emisión de transferencia de carga de los ligandos apilados pi.

Conclusiones:

  • El diseño de los ligandos puentes bis-bidentados con espaciadores aromáticos específicos influye en el autoensamblaje y la estabilidad de las jaulas supramoleculares.
  • El apilamiento de pi aromático periférico en jaulas de L ((naph) mejora su integridad estructural en solución.
  • Estos hallazgos ofrecen información sobre el diseño racional de materiales supramoleculares robustos y funcionales.