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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
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,...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
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...
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
08:15

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Published on: February 11, 2012

Una criptografía y encapsulado germanio (II) dication.

Paul A Rupar1, Viktor N Staroverov, Kim M Baines

  • 1Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7.

Science (New York, N.Y.)
|November 29, 2008
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores sintetizaron una dicación estable de germanio (II) utilizando una criptografía y un ligando. Este hallazgo amplía las posibilidades para estabilizar cationes no metálicos inusuales en química.

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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.
  • Coordinación Química de la Coordinación

Sus antecedentes:

  • Los centros de silicio y germanio oxidados generalmente necesitan fuertes ligandos covalentes para su estabilidad.
  • Los cationes no metálicos son difíciles de sintetizar y estabilizar debido a su alta reactividad.

Objetivo del estudio:

  • Para sintetizar y caracterizar un germanio (II) dication.
  • Para investigar el papel estabilizador de los criptos y ligandos para los cationes no metálicos.

Principales métodos:

  • Síntesis de una sal de dicatión de germanio (II) utilizando criptand [2.2.2] y un complejo de carbenos N-heterocíclicos de GeCl (O3SCF3).
  • Aislamiento y purificación de la sal resultante.
  • Cristalografía de rayos X para determinar la estructura cristalina y las interacciones de enlace.

Principales resultados:

  • Se sintetizó y aisló con éxito la sal de dicatión de germanio (II), (Ge.cryptand[2.2.2]) (O3SCF3) 2, con un rendimiento del 88%.
  • La estructura cristalina reveló una interacción mínima entre el ión germanio (II) y los contraiones triflados, lo que indica una encapsulación efectiva.
  • El compuesto fue aislado como un sólido blanco sensible al aire.

Conclusiones:

  • Las criptas y los ligandos pueden estabilizar eficazmente las inusuales dicciones de germanio.
  • Este trabajo amplía el alcance de los criptandos y moléculas relacionadas en la estabilización de cationes no metálicos.
  • Los hallazgos abren nuevas vías para explorar nuevos compuestos inorgánicos con propiedades electrónicas únicas.