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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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...
EDTA: Auxiliary Complexing Reagents01:26

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...
Complexometric Titration: Ligands00:43

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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Related Experiment Video

Updated: Jul 24, 2026

A Whole Cell Bioreporter Approach to Assess Transport and Bioavailability of Organic Contaminants in Water Unsaturated Systems
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A Whole Cell Bioreporter Approach to Assess Transport and Bioavailability of Organic Contaminants in Water Unsaturated Systems

Published on: December 24, 2014

Tetraaquabis(3,5-dicarboxybenzoato-O)cobalt(II)

Guillou1, Livage, Marrot

  • 1Institut Lavoisier, UMR CNRS 8637, Universite de Versailles Saint-Quentin-en-Yvelines, 45 Avenue des Etats-Unis, F-78035 Versailles, France.

Acta Crystallographica. Section C, Crystal Structure Communications
|December 19, 2000
PubMed
Summary

Researchers synthesized a novel cobalt(II) complex, [Co(C(9)H(5)O(6))(2)(H(2)O)(4)], using a hydrothermal reaction. This structure features a central cobalt ion coordinated with trimesate and water molecules, stabilized by hydrogen bonds.

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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyl(tropone)iron
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Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange
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Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange

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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyl(tropone)iron
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Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange
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Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange

Published on: June 23, 2023

Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Materials Science

Background:

  • Metal-organic complexes are crucial in catalysis and materials science.
  • Hydrothermal synthesis offers a versatile route for crystalline material preparation.
  • Cobalt complexes exhibit diverse coordination geometries and properties.

Purpose of the Study:

  • To synthesize and characterize a novel cobalt(II) complex with trimesate ligands.
  • To investigate the coordination environment and structural features of the new complex.
  • To explore the role of hydrogen bonding in stabilizing the three-dimensional structure.

Main Methods:

  • Hydrothermal reaction of cobalt(II) chloride with trimesate ions in aqueous solution.
  • Single-crystal X-ray diffraction for structural determination.
  • Analysis of coordination geometry and intermolecular interactions.

Main Results:

  • A novel cobalt(II) complex, [Co(C(9)H(5)O(6))(2)(H(2)O)(4)], was successfully synthesized.
  • The cobalt(II) ion is octahedrally coordinated by two trimesate anions and four water molecules.
  • The crystal structure is stabilized by an extensive network of hydrogen bonds, forming a three-dimensional architecture.

Conclusions:

  • The hydrothermal synthesis is effective for creating novel cobalt-trimesate complexes.
  • The coordination environment and hydrogen bonding play key roles in the structural integrity.
  • This study contributes to the understanding of cobalt coordination chemistry and crystal engineering.