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Videos de Conceptos Relacionados

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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...
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...
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.
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...
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...

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Interconversión entre poliedros moleculares y estructuras metal-orgánicas.

Jian-Rong Li1, Daren J Timmons, Hong-Cai Zhou

  • 1Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.

Journal of the American Chemical Society
|April 21, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores construyeron un marco metal-orgánico (MOF) con una topología pcu-a a partir de un octaedro molecular soluble. Este MOF puede ser convertido de manera reversible de nuevo al octaedro a través de reacciones de sustitución de ligando.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química supramolecular de las moléculas.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • Las estructuras metálicas orgánicas (MOF) son materiales cristalinos con propiedades sintonizables.
  • Los octaedros moleculares ofrecen motivos estructurales únicos para materiales avanzados.
  • Las transformaciones reversibles en MOF son cruciales para aplicaciones dinámicas.

Objetivo del estudio:

  • Para construir experimentalmente un marco metal-orgánico (MOF) con una topología pcu-a.
  • Para utilizar un octaedro molecular soluble preensamblado como un bloque de construcción.
  • Para investigar la conversión reversible entre el MOF y el octaedro molecular.

Principales métodos:

  • Síntesis experimental de un nuevo marco metálico-orgánico.
  • Utilizando octaedros moleculares solubles preensamblados.
  • Caracterización de la estructura y propiedades del MOF.
  • Investigar las transformaciones reversibles a través de reacciones de sustitución de ligando axial.

Principales resultados:

  • Construcción exitosa de un MOF con topología pcu-a a partir de un octaedro molecular.
  • Demostración de la conversión reversible entre el MOF y el octaedro molecular.
  • Identificación de la sustitución de ligando axial como el mecanismo de reacción clave.

Conclusiones:

  • El estudio demuestra un nuevo método para la construcción de MOF utilizando precursores moleculares solubles.
  • La naturaleza reversible de la conversión MOF-octaedro abre posibilidades para materiales dinámicos.
  • La sustitución del ligando axial proporciona una vía controlable para el ensamblaje y desmontaje de MOF.