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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,...
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Lattice Centering and Coordination Number02:33

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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.
Types of Unit Cells
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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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Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
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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.
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Polimorfismo en un nanocúmulo de precisión atómica que incorpora un núcleo tetraédrico

Bao-Liang Han1, Zhen Liu2, Lei Feng1

  • 1Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China.

Journal of the American Chemical Society
|March 5, 2020
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Resumen

Los investigadores desarrollaron un nanocúmulo de cobre 23 estable utilizando una estrategia de reducción de gradiente. Este avance permite un análisis estructural preciso y una síntesis controlable de nanocúmulos polimórficos de cobre, superando los problemas de inestabilidad anteriores.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Nanotecnología
  • Química inorgánica

Sus antecedentes:

  • Los nanocúmulos de cobre suelen exhibir inestabilidad, lo que dificulta la determinación estructural precisa.
  • La caracterización atómica precisa de los nanocúmulos es crucial para comprender sus propiedades y aplicaciones.

Objetivo del estudio:

  • Para sintetizar y dilucidar estructuralmente un nanocúmulo de cobre estable.
  • Desarrollar un método controlable para la producción de nanocúmulos polimórficos de cobre.

Principales métodos:

  • Se utilizó una estrategia de reducción de gradiente (GRS) que incluía los intermedios Cu(II), Cu(I) y Cu(0).
  • Se emplean precursores específicos: Cu ((CF3COO) 2, t-BuCCH, polvo de Cu y Ph2SiH2.
  • Estructuras de nanocluster analizadas mediante técnicas de caracterización de estado sólido.

Principales resultados:

  • Se ha sintetizado con éxito un nanocúmulo de cobre 23 estable al aire y a la humedad (SD/Cu23a o SD/Cu23b).
  • Se determinó la estructura: un núcleo tetraédrico [Cu4]0 dentro de una cáscara Cu19, estabilizado por los ligandos t-BuCC- y CF3COO-.
  • Identificó el nanocúmulo Cu23 como un superátomo raro de cuatro electrones con configuración electrónica 1S21P2.
  • Se observaron dos polimorfas distintas (R3c y R3̅) dependientes del disolvente de cristalización, influenciadas por las interacciones intermoleculares.

Conclusiones:

  • La estrategia de reducción de gradiente es efectiva para sintetizar nanocúmulos de cobre estables y precisos para los átomos.
  • Demostró un control preciso sobre la formación polimórfica de los nanocúmulos de cobre.
  • Avanzó la comprensión fundamental de la síntesis de nanocúmulos de cobre y la diversidad estructural.