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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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

Complexation Equilibria: Factors Influencing Stability of Complexes

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...
Valence Bond Theory02:42

Valence Bond Theory

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...
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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.
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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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High Resolution Physical Characterization of Single Metallic Nanoparticles
09:56

High Resolution Physical Characterization of Single Metallic Nanoparticles

Published on: June 28, 2019

Metal-nucleic acid cages.

Hua Yang1, Christopher K McLaughlin, Faisal A Aldaye

  • 1Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, QC H3A 2K6, Canada.

Nature Chemistry
|March 8, 2011
PubMed
Summary
This summary is machine-generated.

Researchers created novel metal-DNA cages by precisely positioning transition metals within a 3D DNA structure. This breakthrough enables controlled cargo manipulation for advanced applications.

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Last Updated: Jun 3, 2026

High Resolution Physical Characterization of Single Metallic Nanoparticles
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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Metallo-supramolecular cages offer functional control over encapsulated substances using embedded metals.
  • DNA's programmability allows for precise control over cage size, shape, chemistry, and metal placement.
  • Existing systems lack the ability to precisely position multiple transition metals within a 3D framework.

Purpose of the Study:

  • To quantitatively construct metal-DNA cages with site-specific transition metal incorporation.
  • To demonstrate the precise, programmable positioning of metals within a 3D DNA architecture.
  • To explore the potential of these novel materials for controlled cargo encapsulation and release.

Main Methods:

  • Organizing oligonucleotide strands with metal-coordination sites into DNA triangles.
  • Assembling these DNA triangles into a 3D DNA prism structure using linking strands.
  • Incorporating various transition metals at pre-programmed locations within the DNA prism framework.

Main Results:

  • Successful quantitative construction of metal-DNA cages.
  • Demonstrated site-specific incorporation of multiple transition metals within the 3D DNA architecture.
  • Achieved precise control over metal positioning within the cage framework.

Conclusions:

  • This work presents a novel method for creating metal-DNA cages with precisely positioned transition metals.
  • The developed framework allows for unprecedented control over metal placement in 3D DNA structures.
  • These metal-DNA hosts hold significant potential for applications in biomolecule and nanomaterial encapsulation, sensing, and modification.