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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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Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
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Related Experiment Video

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Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
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Chemistry and properties at a sub-nanometer scale.

Bing Ni1, Xun Wang1

  • 1Key Lab of Organic Optoelectronics and Molecular Engineering , Department of Chemistry , Tsinghua University , Beijing , 100084 , China .

Chemical Science
|August 30, 2018
PubMed
Summary

Ultrathin materials at the sub-nanometer scale exhibit unique properties and behaviors. Exploring their chemistry and design offers significant potential for advanced applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Ultrathin materials at the sub-nanometer scale possess unique properties due to their atomic-scale dimensions.
  • These materials offer significant potential compared to conventional nanomaterials.
  • Sub-nanometric (SN) materials exhibit distinct behaviors influenced by weak interactions.

Purpose of the Study:

  • To explore the properties and potential of ultrathin materials at the sub-nanometer scale.
  • To discuss the growth mechanisms, applications, and potential of SN wires.
  • To highlight the underexplored chemistry at the sub-nanometer regime.

Main Methods:

  • Discussion of growth mechanisms for SN wires.
  • Analysis of properties of 0D (clusters) and 2D (sheets) SN materials.

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  • Exploration of the influence of weak interactions on SN material behavior.

    • Main Results:

    • SN wires can exhibit intricate structures and polymer-like rheology due to weak interactions.
    • 0D SN clusters are analogous to molecules, and 2D SN sheets possess unique electronic structures.
    • The chemistry of SN materials is crucial for application-oriented research but remains underexplored.

    Conclusions:

    • Sub-nanometer materials hold great potential due to their unique properties and behaviors.
    • Further research into the chemistry and applications of SN materials is warranted.
    • Significant challenges remain in harnessing the full potential of the sub-nanometer scale.