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Related Concept Videos

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...
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.
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...
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...

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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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A hexaicosametallic copper(II) phosphonate.

Vadapalli Chandrasekhar1, Dipankar Sahoo, Ramakirushnan Suriya Narayanan

  • 1Department of Chemistry, Indian Institute of Technology-Kanpur, Kanpur-208016, India. vc@iitk.ac.in

Dalton Transactions (Cambridge, England : 2003)
|May 11, 2013
PubMed
Summary

Researchers synthesized the largest discrete molecular homometallic transition metal phosphonate assembly, a gigantic copper phosphonate complex, using a simple room-temperature solution method.

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Published on: November 22, 2016

Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Transition metal phosphonates are versatile materials with applications in catalysis, magnetism, and gas storage.
  • The synthesis of large, discrete molecular assemblies presents significant challenges in controlling structure and dimensionality.

Purpose of the Study:

  • To report the structure and characterization of a novel, large discrete molecular homometallic transition metal phosphonate assembly.
  • To demonstrate a facile synthetic route for preparing such complex structures at room temperature.

Main Methods:

  • Single-crystal X-ray diffraction for structural determination.
  • Elemental analysis and thermogravimetric analysis for composition and stability.
  • Infrared spectroscopy for functional group identification.

Main Results:

  • The successful synthesis and characterization of a gigantic copper phosphonate complex, denoted as 1: [Cu26{2,3,5,6-(Me)4C6H-CH2-PO3}18(μ2-OH)4(μ3-OH)6(μ4-Cl)6(μ-OH2)2(OH2)2(MeCN)4]·6MeCN·15H2O.
  • Complex 1 represents the largest discrete molecular homometallic transition metal phosphonate assembly reported to date.
  • The complex was prepared via a normal solution synthetic method at room temperature.

Conclusions:

  • The study reports a significant advancement in the synthesis of large, discrete transition metal phosphonate assemblies.
  • The room-temperature solution method offers a practical approach for accessing complex molecular architectures.
  • This work opens avenues for exploring the properties and applications of giant phosphonate-based materials.