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Videos de Conceptos Relacionados

Metallic Solids02:37

Metallic Solids

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. Many...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Coordination Number and Geometry02:57

Coordination Number and Geometry

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.
Structural Isomerism02:34

Structural Isomerism

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.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Valence Bond Theory02:42

Valence Bond Theory

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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Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium
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Un polímero de coordinación basado en clúster Cu6S4 de doce conexiones conectadas.

Xian-Ming Zhang1, Rui-Qin Fang, Hai-Shun Wu

  • 1School of Chemistry and Material Science, Shanxi Normal University, Linfen 041004, Shanxi, PR China. zhangxm@dns.sxtu.edu.cn

Journal of the American Chemical Society
|May 26, 2005
PubMed
Resumen

Los investigadores sintetizaron un nuevo marco metálico-orgánico utilizando una reacción hidrotermal. Este nuevo material exhibe una topología cúbica única de doce caras conectadas centradas en la cara con grupos específicos de cobre y azufre como nodos.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química Inorgánica La química inorgánica es la química inorgánica.
  • La cristalografía es una técnica de cristalografía.

Sus antecedentes:

  • Las estructuras metálicas orgánicas (MOF) son materiales porosos cristalinos con diversas aplicaciones.
  • El diseño racional y la síntesis de MOF con topologías específicas y estructuras de nodos son cruciales para el desarrollo de materiales avanzados.

Objetivo del estudio:

  • Para sintetizar un nuevo marco metálico-orgánico con una estructura topológica única.
  • Para caracterizar el material resultante e identificar sus características estructurales, incluyendo la composición de los nodos y la conectividad.

Principales métodos:

  • Reacción hidrotermal que utiliza el acetato de cobre (II), el ácido acético (4-piridiltio) y el tiocianato de amonio como precursores.
  • Difracción de rayos X monocristalino para la determinación estructural del marco metal-orgánico sintetizado.

Principales resultados:

  • Síntesis exitosa de un nuevo marco metálico-orgánico, denotado como [Cu3 ((4-piridinetiolato) 2 ((CN)) ].
  • El marco exhibe una topología cúbica (fcc) de doce conexiones, centrada en la cara.
  • Los nodos del marco se identifican como grupos Cu6S4, lo que indica un entorno específico de coordinación metal-azufre.

Conclusiones:

  • La síntesis hidrotermal proporciona una ruta viable para construir MOFs complejos con topologías diseñadas.
  • Los cúmulos Cu6S4 identificados como nodos contribuyen a la estructura única de doce conexiones fcc.
  • Este trabajo amplía la biblioteca de MOFs con motivos estructurales interesantes y potencial para una mayor investigación.