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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...
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...
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...
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,...
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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 Single-Crystalline Core-Shell Metal-Organic Frameworks
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

Organic multishell isostructural host-guest crystals: fullerenes C(60) inside a nitroxide open framework.

David Bardelang1, Michel Giorgi, Cédric Pardanaud

  • 1Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France. david.bardelang@univ-amu.fr

Chemical Communications (Cambridge, England)
|March 21, 2013
PubMed
Summary

Dinitroxide biradical forms hexagonal frameworks with channels capable of encapsulating C(60) molecules. This rapid crystal growth method enables the creation of multilayer host-guest structures for advanced materials.

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Preparation and Characterization of C60/Graphene Hybrid Nanostructures
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Preparation and Characterization of C60/Graphene Hybrid Nanostructures
08:40

Preparation and Characterization of C60/Graphene Hybrid Nanostructures

Published on: May 15, 2018

Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Dinitroxide biradicals are known for their unique electronic properties.
  • Open framework materials offer potential for host-guest chemistry.
  • C(60) (Buckminsterfullerene) is a significant carbon allotrope with diverse applications.

Purpose of the Study:

  • To investigate the crystallization behavior of dinitroxide biradicals.
  • To explore the formation of host-guest complexes with C(60) within these frameworks.
  • To develop a method for creating multilayer host-guest crystals.

Main Methods:

  • Crystallization of dinitroxide biradical to form hexagonal open frameworks.
  • Inclusion of C(60) within the framework's channels and pockets.
  • Layer-by-layer crystal growth and staining techniques.

Main Results:

  • Hexagonal open frameworks with one-dimensional corrugated channels were successfully formed.
  • Large pockets within the channels facilitated the inclusion of C(60).
  • Isostructural multilayer host-guest crystals were prepared with high fidelity and rapidity.

Conclusions:

  • Dinitroxide biradical frameworks can effectively host C(60) molecules.
  • The rapid and controlled crystal growth is suitable for creating complex supramolecular architectures.
  • This work demonstrates a novel approach for fabricating functional host-guest materials.