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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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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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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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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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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Click-derived multifunctional metal complexes for diverse applications.

Md Gulzar Ahmad1, M M Balamurali2, Kaushik Chanda1

  • 1Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, Tamilnadu, India. chandakaushik1@gmail.com.

Chemical Society Reviews
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Summary
This summary is machine-generated.

Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) click chemistry enables efficient synthesis of complex molecules and drug candidates. Its biocompatibility makes it valuable for drug delivery and biomedical research.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Materials Science

Background:

  • The Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reaction, a prominent example of click chemistry, is a highly reliable method for constructing complex molecular structures.
  • Click chemistry offers enhanced synthetic flexibility, reliability, specificity, and modularity, making it ideal for creating diverse molecular architectures.
  • Its biocompatibility and inertness in biological environments make it exceptionally useful in pharmaceutical research and biomedical applications.

Purpose of the Study:

  • To review the applications and unique properties of various click-derived transition metal complexes.
  • To highlight the versatility of click chemistry in organic synthesis, particularly with biocompatible precursors.
  • To explore the broader scope of click chemistry in applied sciences.

Main Methods:

  • Review of literature on Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reactions.
  • Analysis of transition metal complexes synthesized using click chemistry principles.
  • Discussion of applications in organic synthesis, drug discovery, and biomedical research.

Main Results:

  • CuAAC click chemistry is a powerful tool for synthesizing complex molecules and drug candidates with high efficiency and specificity.
  • Click chemistry has demonstrated significant utility in drug delivery systems due to its biocompatibility and inertness.
  • Various click-derived transition metal complexes exhibit unique properties and diverse applications.

Conclusions:

  • Click chemistry, particularly CuAAC, is a cornerstone in modern synthetic strategies for complex molecules and pharmaceuticals.
  • The biocompatibility and modularity of click chemistry make it indispensable for advancements in drug delivery and biomedical research.
  • The review underscores the expanding influence and potential of click chemistry across multiple scientific disciplines.