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Related Concept Videos

Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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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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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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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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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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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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Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Biomimetic cavity-based metal complexes.

Jean-Noël Rebilly1, Benoit Colasson, Olivia Bistri

  • 1Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, UMR CNRS 8601, Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints Pères, 75006 Paris, France. Olivia.Reinaud@parisdescartes.fr.

Chemical Society Reviews
|October 17, 2014
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Summary
This summary is machine-generated.

Biomimetic complexes mimic metallo-enzyme active sites, revealing how protein pockets influence metal ion reactivity. This understanding aids in designing efficient catalysts and sensitive probes for Nature's chemistry.

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Area of Science:

  • Bioinorganic Chemistry
  • Biomimetic Chemistry
  • Enzyme Catalysis

Background:

  • Metallo-enzyme active sites are crucial for biological catalysis.
  • Biomimetic complexes offer insights into enzyme mechanisms.
  • Protein cavities play a key role in metal ion function and reactivity.

Purpose of the Study:

  • To review the design of biomimetic complexes incorporating protein-like cavities.
  • To explore host-guest chemistry within these biomimetic systems.
  • To highlight the impact of cavity effects on metal ion binding and reactivity.

Main Methods:

  • Review of existing literature on biomimetic complexes and enzyme active site modeling.
  • Analysis of host-guest interactions, ligand orientation, and exchange mechanisms.
  • Examination of cavity effects on metal ion coordination spheres and hydrophobic interactions.

Main Results:

  • Cavity-based biomimetic complexes can effectively model metallo-enzyme active sites.
  • Host-guest chemistry, including ligand dynamics, is critical for reactivity.
  • Protein pocket environments significantly influence metal ion binding and catalytic activity.

Conclusions:

  • Understanding cavity effects is essential for designing functional biomimetic systems.
  • This knowledge can lead to the development of novel bio-inspired catalysts and sensors.
  • Biomimetic approaches provide valuable insights into fundamental enzymatic processes.