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Related Concept Videos

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...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
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...
Stereoisomerism02:52

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyl(tropone)iron
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Tris(ethane-1,2-diamine)copper(II) bis-(trifluoro-acetate).

Elena V Karpova, Maxim A Zakharov, Alexandr I Boltalin

    Acta Crystallographica. Section E, Structure Reports Online
    |January 5, 2011
    PubMed
    Summary

    This study details a copper(II) complex with ethane-1,2-diamine ligands, revealing a distorted octahedral coordination. The complex forms a 3D framework via hydrogen bonds with trifluoro-acetate anions.

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    Area of Science:

    • Coordination Chemistry
    • Crystal Engineering
    • Materials Science

    Background:

    • Copper complexes are vital in catalysis and materials science.
    • Ethane-1,2-diamine is a common chelating ligand in coordination chemistry.
    • Hydrogen bonding plays a crucial role in crystal structure formation.

    Purpose of the Study:

    • To synthesize and characterize a novel copper(II) complex.
    • To investigate the coordination environment around the copper atom.
    • To explore the supramolecular structure formed by hydrogen bonding.

    Main Methods:

    • Single-crystal X-ray diffraction was used to determine the crystal structure.
    • Analysis of bond lengths and angles elucidated the coordination geometry.
    • Hydrogen bond interactions were identified and analyzed.

    Main Results:

    • A copper(II) complex, [Cu(ethane-1,2-diamine)3](trifluoroacetate)2, was synthesized.
    • The copper atom exhibits a distorted octahedral coordination geometry.
    • The complex forms a three-dimensional framework through N-H···O and N-H···F hydrogen bonds.

    Conclusions:

    • The study provides insights into the structural properties of copper(II) complexes with ethane-1,2-diamine.
    • The formation of a 3D framework highlights the importance of hydrogen bonding in crystal engineering.
    • The disordered trifluoroacetate anions present interesting structural features.