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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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...
Metal-Ligand Bonds02:51

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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Whole-mol-ecule disorder of the heterometallic complex di-aqua-1κ<sup>2</sup> <i>O</i>-di-chlorido-2κ<sup>2</sup> <i>Cl</i>-(μ-2-formyl-6-meth-oxy-phenolato-1κ<sup>2</sup> <i>O</i> <sup>1</sup>,<i>O</i> <sup>2</sup>:2κ<i>O</i> <sup>6</sup>){μ-2-meth-oxy-6-[(methyl-imino)-meth-yl]phenolato-1κ<sup>2</sup> <i>N</i>,<i>O</i> <sup>1</sup>:2κ<i>O</i> <sup>6</sup>}lead(II)nickel(II).

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Updated: Jun 1, 2026

Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase
06:31

Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase

Published on: March 19, 2020

Bis[N-(2-hydroxy-ethyl)-N-methyl-glycinato]copper(II).

Elena A Buvaylo, Volodymyr N Kokozay, Olga Yu Vassilyeva

    Acta Crystallographica. Section E, Structure Reports Online
    |May 18, 2011
    PubMed
    Summary

    A copper(II) complex with N-(2-hydroxy-ethyl)-N-methyl-glycine was unintentionally synthesized. This centrosymmetric molecule features a distorted octahedral copper ion coordinated by two tridentate ligands, forming bicyclic chelates.

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    Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

    Published on: September 7, 2019

    Area of Science:

    • Inorganic Chemistry
    • Coordination Chemistry
    • Crystallography

    Background:

    • Mixed-metal complexes involving copper and cadmium are of interest for their diverse properties.
    • The synthesis of coordination compounds often involves careful control of precursors and reaction conditions.
    • Unintentional product formation can reveal novel synthetic pathways and compound structures.

    Purpose of the Study:

    • To characterize the unintentionally formed copper(II) complex.
    • To elucidate the coordination mode and geometry of the copper(II) ion.
    • To investigate the crystal structure and intermolecular interactions.

    Main Methods:

    • Single crystal X-ray diffraction.
    • Chemical synthesis and characterization.
    • Spectroscopic analysis (implied).

    Main Results:

    • The title compound, [Cu(C(5)H(10)NO(3))(2)], was isolated as an unintended product.
    • The molecule is centrosymmetric, with the copper(II) ion coordinated in a distorted octahedral geometry.
    • Two monodeprotonated N-(2-hydroxy-ethyl)-N-methyl-glycine ligands coordinate in a tridentate fashion, forming bicyclic chelates.
    • Intermolecular O-H⋯O hydrogen bonds link molecules into columns along the a axis.

    Conclusions:

    • The study reports the unintentional synthesis and structural characterization of a novel copper(II) complex.
    • The coordination chemistry of N-(2-hydroxy-ethyl)-N-methyl-glycine with copper(II) has been demonstrated.
    • The crystal packing reveals significant intermolecular hydrogen bonding interactions.