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Related Concept Videos

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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Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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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: Chemistry and Properties01:22

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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...
Colors and Magnetism03:02

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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.
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

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Redetermination of poly[aquadi-μ(3)-oxy-diacetato-dicopper(II)].

Ming-Lin Guo1

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This study details the precise crystal structure of a copper(II) complex, [Cu(2)(C(4)H(4)O(5))(2)(H(2)O)](n), revealing a two-dimensional layered arrangement stabilized by hydrogen bonds.

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Area of Science:

  • Coordination Chemistry
  • Crystallography
  • Materials Science

Background:

  • The copper(II) complex [Cu(2)(C(4)H(4)O(5))(2)(H(2)O)](n) was previously reported.
  • Accurate structural data is crucial for understanding material properties and reactivity.

Purpose of the Study:

  • To redetermine the crystal structure of the title copper(II) complex with higher precision.
  • To provide a more accurate structural model for [Cu(2)(C(4)H(4)O(5))(2)(H(2)O)](n).

Main Methods:

  • Single-crystal X-ray diffraction.
  • Crystal structure refinement.

Main Results:

  • The complex exhibits a two-dimensional layered structure.
  • The copper atom is in a distorted octahedral (CuO(6)) environment.
  • Intra- and intermolecular hydrogen bonds contribute to crystal stabilization.

Conclusions:

  • The redetermined structure offers a more precise description of the copper(II) complex.
  • This enhanced structural understanding can inform future applications and studies of similar coordination compounds.