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Related Concept Videos

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Metal-Ligand Bonds

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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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Structural Isomerism

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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...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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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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Supramolecular Chirality in Metal-Organic Complexes.

Jinqiao Dong1, Yan Liu1, Yong Cui1

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Chiral metal-organic complexes (MOCs) demonstrate supramolecular chirality exceeding their molecular components. These MOCs show promise as enantioselective agents, artificial receptors, and asymmetric catalysts for diverse applications.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Chemical Biology

Background:

  • Chirality is fundamental to biological systems, influencing molecular interactions and functions.
  • Understanding and replicating chirality in synthetic systems is crucial for biochemistry and pharmacology.
  • Homochiral metal-organic complexes (MOCs) offer a platform to study enantioselective processes due to their defined chiral microenvironments.

Purpose of the Study:

  • To review research on rationally designed, synthetically accessible chiral MOCs over 12 years.
  • To explore chirality transfer and amplification in self-assembled chiral metallacycles.
  • To highlight the development of chiral MOCs as artificial receptors and supramolecular asymmetric catalysts.

Main Methods:

  • Coordination-driven self-assembly of molecular precursors into chiral metallacycles and metallacages.
  • Design of MOCs with specific functional groups (e.g., NH, hydrophobic groups) for chiral recognition.
  • Investigation of MOCs as catalysts in confined nanospaces for asymmetric synthesis.

Main Results:

  • Chiral MOCs exhibit supramolecular chirality significantly greater than their constituent molecules.
  • Metallacycles with tailored microenvironments show excellent enantioseparation capabilities.
  • Chiral MOCs function as effective artificial receptors with high enantiorecognition for biomolecules.
  • Chiral metallacages act as efficient supramolecular asymmetric catalysts, enhancing reactivity and enantioselectivity.

Conclusions:

  • Chiral MOCs provide a powerful model for understanding chirality translation from molecular to supramolecular scales.
  • These MOCs hold potential for developing novel chiral materials in chemistry and medicine.
  • Further research into chiral MOCs can unlock new biological insights and technological advancements.