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Videos de Conceptos Relacionados

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.
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries
The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific requirements are not imposed on the...
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.
Removing one hydrogen from the intervening CH2 group with both...
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...
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...

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Video Experimental Relacionado

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Desde un algoritmo de autoclasificación de ocho componentes hasta un triángulo escaleno trisheterometálico.

Kingsuk Mahata1, Manik Lal Saha, Michael Schmittel

  • 1Center of Micro and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Str. 2, D-57068 Siegen, Germany.

Journal of the American Chemical Society
|October 27, 2010
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores diseñaron un triángulo escaleno trisheterometálico dinámico utilizando motivos de autoclasificación. Esta compleja estructura supramolecular expande la conocida biblioteca de arquitecturas triangulares.

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Área de la Ciencia:

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

Sus antecedentes:

  • El campo de la química supramolecular se centra en el diseño y la síntesis de complejas arquitecturas moleculares.
  • Las estructuras supramoleculares triangulares existentes están limitadas en su diversidad y complejidad.

Objetivo del estudio:

  • Para diseñar y fabricar un triángulo escaleno trisheterometálico novedoso y totalmente dinámico.
  • Para ampliar el repertorio de las estructuras supramoleculares triangulares conocidas.

Principales métodos:

  • Utilizando motivos derivados de los principios de auto-clasificación triple y completa.
  • Empleando una biblioteca de ocho componentes para la construcción de la estructura objetivo.

Principales resultados:

  • Diseño y fabricación exitosos de un triángulo escaleno trisheterometálico totalmente dinámico.
  • Demostración de un complejo conjunto supramolecular que complementa las estructuras triangulares existentes.

Conclusiones:

  • El estudio presenta una nueva estructura supramolecular triangular altamente dinámica.
  • La estrategia de autoclasificación empleada es efectiva para la construcción de arquitecturas complejas y multicomponentes.