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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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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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A Facile and Efficient Approach for the Production of Reversible Disulfide Cross-linked Micelles
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Poly[[μ(7)-l-cysteato(2-)]disodium].

Fu-Hong Liu1

  • 1Basis Department, Jilin Business and Technology College, Hao Yue Road No. 1606, Changchun, Jilin, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|November 8, 2011
PubMed
Summary

A novel sodium coordination polymer was synthesized from l-cysteic acid and sodium hydroxide. This study details its unique 3D framework structure and the distinct coordination environments of the sodium ions.

Area of Science:

  • Materials Science
  • Crystallography
  • Coordination Chemistry

Background:

  • Amino acids are versatile building blocks for coordination polymers.
  • Sodium coordination polymers are of interest for their diverse structural motifs and potential applications.

Purpose of the Study:

  • To synthesize and characterize a novel sodium coordination polymer derived from l-cysteic acid.
  • To elucidate the coordination environment and structural framework of the resulting compound.

Main Methods:

  • Solvent-thermal reaction of l-cysteic acid with aqueous sodium hydroxide.
  • Single-crystal X-ray diffraction to determine the crystal structure and coordination geometry.

Main Results:

  • The compound poly[[μ(7)-(2R)-2-amino-3-sulfonato-propano-ato]disodium], [Na(2)(C(3)H(5)NO(5)S)](n), was successfully synthesized.

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  • Two distinct sodium cations exhibit different coordination spheres: one is pentacoordinated (O(5)) and the other is tetracoordinated (NO(3)).
  • The sulfonate oxygen atoms bridge both sodium ions, leading to a robust three-dimensional polymeric framework.

    • Conclusions:

    • The study presents a novel sodium coordination polymer with a unique 3D framework.
    • The distinct coordination geometries of sodium ions highlight the versatility of l-cysteic acid as a ligand.
    • The findings contribute to the understanding of metal-organic frameworks and coordination chemistry.