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Crystal Field Theory - Octahedral Complexes02:58

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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...
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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.
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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...
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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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MO Theory and Covalent Bonding02:40

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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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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...
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Crystalline metal-organic frameworks (MOFs): synthesis, structure and function.

Chandan Dey1, Tanay Kundu1, Bishnu P Biswal1

  • 1Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune, Maharashtra 411008, India.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|January 21, 2014
PubMed
Summary
This summary is machine-generated.

Metal-organic frameworks (MOFs) are versatile materials with high surface areas. This review covers MOF synthesis, structure, and properties for applications like gas storage and drug delivery.

Keywords:
crystal engineeringmetal-organic frameworksmicroporous materialssynthetic methods

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are hybrid supramolecular solids.
  • They consist of metal cations and organic linkers.
  • MOFs offer high surface areas, tunable pores, and functionality.

Purpose of the Study:

  • To review general and modern synthetic strategies for MOF preparation.
  • To discuss the structural diversity and properties of MOFs.
  • To explore MOF applications in gas storage, drug delivery, and sensing.

Main Methods:

  • Exploration of diverse synthetic routes for MOF construction.
  • Analysis of MOF structural characteristics and pore environments.
  • Evaluation of MOF performance in various application contexts.

Main Results:

  • MOFs exhibit significant structural diversity and tunable properties.
  • Various synthetic methods enable controlled MOF fabrication.
  • MOFs show promise for gas storage, drug delivery, and sensing.

Conclusions:

  • MOFs are promising materials with broad application potential.
  • Continued research in synthesis and characterization will drive innovation.
  • MOFs are key to advancements in materials science and nanotechnology.