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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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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Coordination Number and Geometry02:57

Coordination Number and Geometry

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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.
19.5K
Structural Isomerism02:34

Structural Isomerism

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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...
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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

27.8K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Colors and Magnetism03:02

Colors and Magnetism

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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...
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Related Experiment Video

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Divalent Fe Atom Coordination in Two-Dimensional Microporous Graphitic Carbon Nitride.

Youngtak Oh, Jin Ok Hwang, Eui-Sup Lee

  • 1Department of Chemistry and Nano Science, Ewha Womans University , Seoul 120-750, Korea.

ACS Applied Materials & Interfaces
|August 31, 2016
PubMed
Summary

Graphitic carbon nitride (g-C3N4) functionalized with iron (Fe(2+)) shows unique coordination and electronic properties. This metal-functionalized material demonstrates potential for enhanced photocatalytic applications.

Keywords:
Fecarbon nitridecoordinationdensity functional theoryheteroatom dopingphotocatalyst

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Graphitic carbon nitride (g-C3N4) is a 2D semiconducting material with a unique structure.
  • Its porous nature and electron-rich nitrogen sites offer potential for metal coordination.
  • Understanding metal coordination and electronic variations in g-C3N4 is crucial for applications.

Purpose of the Study:

  • To detail the coordination of divalent iron (Fe(2+)) within the micropores of graphitic carbon nitride (g-C3N4).
  • To provide experimental and computational evidence for the Fe(2+) coordination mechanism.
  • To investigate the impact of Fe(2+) functionalization on the electronic structure and photocatalytic activity of g-C3N4.

Main Methods:

  • Experimental characterization of Fe(2+) coordinated g-C3N4.
  • Computational modeling to elucidate local coordination and electronic structure changes.
  • Comparative photocatalytic activity tests of pristine and Fe(2+)-functionalized g-C3N4.

Main Results:

  • Detailed bond coordination of Fe(2+) at the micropore sites of g-C3N4 was established.
  • Experimental and computational data confirmed the Fe(2+) coordination and associated electronic structure modifications.
  • Fe(2+)-functionalized g-C3N4 exhibited altered photocatalytic activity compared to pristine g-C3N4.

Conclusions:

  • Divalent iron (Fe(2+)) can be effectively coordinated within the micropores of graphitic carbon nitride (g-C3N4).
  • Metal coordination significantly influences the electronic structure of g-C3N4.
  • Fe(2+)-functionalized g-C3N4 presents a promising platform for enhanced photocatalysis.