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EDTA: Chemistry and Properties

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...

EDTA: Auxiliary Complexing Reagents

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...

Masking and Demasking Agents

Masking and Demasking Agents

EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...

Complexometric Titration: Ligands

Complexometric Titration: Ligands

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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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

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Poly[[aqua(mu(7)-ethylenediaminetetraacetato)dicadmium(II)] monohydrate].

Er Lei Yang¹, Yun Liang Jiang, Yu Ling Wang

¹College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, People's Republic of China.

Acta Crystallographica. Section C, Crystal Structure Communications

|September 4, 2010

Summary

This study details a novel 2D layered coordination polymer of Cadmium(II) and ethylenediaminetetraacetate (edta). The structure features bridged cadmium dimers forming layers connected by cadmium-oxygen bonds and stabilized by hydrogen bonding.

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A Study of the Complexation of Mercury(II) with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry

A Study of the Complexation of Mercury(II) with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry

Published on: January 8, 2016

Area of Science:

Coordination Chemistry
Materials Science
Crystallography

Background:

Ethylenediaminetetraacetate (edta) is a versatile chelating agent widely used in coordination chemistry.
Cadmium(II) complexes exhibit diverse structural motifs and potential applications.

Purpose of the Study:

To synthesize and characterize a novel 2D layered coordination polymer involving Cadmium(II) and edta.
To elucidate the crystal structure and supramolecular assembly of the title compound.

Main Methods:

Single-crystal X-ray diffraction analysis was employed to determine the crystal structure.
Infrared spectroscopy and elemental analysis may have been used for characterization (inferred).

Main Results:

The structure consists of two independent Cd(II) cations and one edta tetraanion per formula unit, along with coordinated and solvent water molecules.
A 2D layered structure is formed by bridging Cd(II) atoms and Cd-O bonds, with hydrogen bonding contributing to layer stability.
Distorted pentagonal-bipyramidal and octahedral coordination geometries were observed for the Cd(II) centers.

Conclusions:

The study successfully synthesized and characterized a novel 2D layered cadmium-edta coordination polymer.
The crystal structure reveals intricate coordination environments and supramolecular interactions, including hydrogen bonding.