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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.
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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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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

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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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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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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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A Four-Coordinate End-On Superoxocopper(II) Complex: Probing the Link between Coordination Number and Reactivity.

Suman Debnath1, Shoba Laxmi1, Olivia McCubbin Stepanic2

  • 1Division of Chemistry and Biological Chemistry, School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore.

Journal of the American Chemical Society
|August 28, 2024
PubMed
Summary

A new four-coordinate superoxocopper(II) complex exhibits enhanced reactivity compared to its five-coordinate counterpart. This difference, attributed to higher electrophilicity, is crucial for understanding copper-containing enzymes and their oxidation mechanisms.

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Area of Science:

  • Inorganic Chemistry
  • Bioinorganic Chemistry
  • Coordination Chemistry

Background:

  • Five-coordinate end-on superoxocopper(II) complexes primarily react via hydrogen atom transfer (HAT).
  • Most reported four-coordinate superoxocopper(II) complexes display nucleophilic reactivity, contrasting with their five-coordinate counterparts.
  • Understanding the factors governing the reactivity of superoxocopper(II) complexes is essential for elucidating biological oxidation processes.

Purpose of the Study:

  • To investigate the origin of differing reactivity between four- and five-coordinate end-on superoxocopper(II) complexes.
  • To synthesize and characterize a novel four-coordinate superoxocopper(II) complex with a sterically encumbered ligand.
  • To compare the substrate reactivity of the new four-coordinate complex with a known five-coordinate analogue.

Main Methods:

  • Synthesis of a four-coordinate end-on superoxocopper(II) complex, [CuII(η1-O2•-)(dpb2-MeBPA)]+ (1).
  • Kinetic isotope effect (KIE) measurements to probe reaction mechanisms.
  • Correlation of second-order rate constants (k2) with oxidation potentials (Eox) for various substrates.

Main Results:

  • Complex 1 reacts with phenols via a hydrogen atom transfer (HAT) mechanism, similar to the five-coordinate complex [CuII(η1-O2•-)(dpb3-TMPA)]+ (2).
  • Complex 1 exhibits significantly enhanced HAT reactivity, with rates >100 times faster for certain phenols compared to complex 2.
  • Complex 1 demonstrates superior ability to oxidize C-H bonds in substrates like N-methyl-9,10-dihydroacridine, reacting ~200 times faster than complex 2.

Conclusions:

  • The enhanced substrate oxidation facility of complex 1 is attributed to its higher inherent electrophilicity, a direct result of its lower coordination number.
  • These findings highlight the critical role of coordination number in dictating the reactivity of superoxocopper(II) intermediates.
  • The results provide valuable insights into the mechanisms of copper-containing enzymes, where four-coordinate superoxocopper(II) intermediates are often implicated as active oxidants.