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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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Overview
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Complexation Equilibria: Overview01:23

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Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Metal-Ligand Bonds02:51

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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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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Related Experiment Video

Updated: May 5, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

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Extended covalent containers: synthesis and guest encapsulation.

A Asadi1, D Ajami, J Rebek

  • 1The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. jrebek@scripps.edu.

Chemical Communications (Cambridge, England)
|November 26, 2013
PubMed
Summary
This summary is machine-generated.

Two novel covalent capsules featuring biphenyl and azobenzene spacers were synthesized. These robust, tubular structures can encapsulate large guests like squalene.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Covalent capsules represent advanced molecular architectures with potential applications in molecular recognition and encapsulation.
  • Designing robust and size-tunable host molecules is crucial for selective guest binding.

Purpose of the Study:

  • To synthesize and characterize novel covalent capsules with specific structural features.
  • To investigate the stability and guest-binding capabilities of the synthesized capsules.

Main Methods:

  • Utilized organic synthesis techniques to construct capsule frameworks.
  • Employed spectroscopic and analytical methods for structural characterization.
  • Performed stability studies in various media and guest encapsulation experiments.

Main Results:

  • Successfully synthesized two new covalent capsules incorporating biphenyl and azobenzene spacers.
  • The tubular capsules demonstrated significant robustness across a range of chemical environments.
  • The capsules were capable of accommodating large guest molecules, exemplified by squalene.

Conclusions:

  • The developed covalent capsules exhibit promising structural integrity and guest accommodation properties.
  • These findings contribute to the development of advanced host-guest systems for potential applications in chemistry and materials science.