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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

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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.
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Metal-Ligand Bonds02:51

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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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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Valence Bond Theory02:42

Valence Bond Theory

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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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Crystal Field Theory - Octahedral Complexes02:58

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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...
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Metallic Solids02:37

Metallic Solids

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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.
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Updated: Mar 16, 2026

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A structurally flexible triazolate-based metal-organic framework featuring coordinatively unsaturated copper(i)

P Schmieder1, D Denysenko, M Grzywa

  • 1Augsburg University, Institute of Physics, Chair of Solid State and Materials Chemistry, Universitaetsstrasse 1, 86159 Augsburg, Germany. dirk.volkmer@physik.uni-augsburg.de.

Dalton Transactions (Cambridge, England : 2003)
|August 12, 2016
PubMed
Summary

A new metal-organic framework, CFA-8, was synthesized and exhibits a reversible breathing effect. Its Cu(I) sites can bind carbon monoxide, forming a weak complex.

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Area of Science:

  • Materials Science
  • Chemistry
  • Crystallography

Background:

  • Metal-organic frameworks (MOFs) are porous materials with diverse applications.
  • Developing novel MOFs with specific functionalities is an active area of research.

Purpose of the Study:

  • To synthesize and characterize a novel metal-organic framework, CFA-8.
  • To investigate the gas adsorption properties and structural behavior of CFA-8.

Main Methods:

  • Single-crystal and powder X-ray diffraction for structural determination.
  • Thermogravimetric analysis (TGA) and IR spectroscopy for material characterization.
  • Gas sorption measurements (CO adsorption isotherms) and synchrotron X-ray diffraction for studying guest-host interactions.

Main Results:

  • Successful synthesis of CFA-8 [Cu2(tqpt)] with a lenticular crystal shape.
  • Observation of a reversible breathing effect in CFA-8, indicating structural flexibility.
  • Demonstration of CO binding to Cu(I) sites within the framework, forming a weak complex.

Conclusions:

  • CFA-8 is a robust, flexible metal-organic framework with potential for gas storage and separation.
  • The Cu(I) sites in CFA-8 can selectively bind CO, offering insights into MOF-gas interactions.