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Related Concept Videos

Redox Reactions01:24

Redox Reactions

59.0K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
59.0K
Redox Reactions01:27

Redox Reactions

1.2K
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Formation of Complex Ions03:45

Formation of Complex Ions

26.4K
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...
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

1.5K
Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
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Related Experiment Video

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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Reactivity of a stable copper-dioxygen complex.

Diana A Iovan1, Alexandra T Wrobel, Arthur A McClelland

  • 1Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA. betley@chemistry.harvard.edu.

Chemical Communications (Cambridge, England)
|September 5, 2017
PubMed
Summary

Researchers isolated a stable copper-dioxygen complex with side-on O2 coordination. This complex shows reactivity in hydrogen-atom abstraction and acid/base chemistry, proving side-on superoxide

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Bioinorganic Chemistry

Background:

  • Copper-dioxygen complexes are crucial in biological oxidation reactions.
  • Understanding the reactivity of these complexes is key to developing new catalysts.
  • Previous studies have focused on end-on coordination, limiting insights into alternative binding modes.

Purpose of the Study:

  • To isolate and characterize a novel room temperature stable dipyrromethene copper(II)-dioxygen complex.
  • To investigate the reactivity of a side-on coordinated dioxygen adduct.
  • To explore the potential of such complexes in catalytic applications.

Main Methods:

  • Synthesis of a dipyrromethene ligand and its subsequent complexation with copper.
  • Isolation and characterization of the copper(II)-dioxygen complex using spectroscopic techniques (e.g., UV-Vis, EPR) and X-ray crystallography.
  • Reactivity studies involving phenols to probe hydrogen-atom abstraction and acid/base chemistry.

Main Results:

  • Successful isolation of a room temperature stable dipyrromethene Cu(II)(O2) complex.
  • X-ray crystallography confirmed a rare side-on coordination of the O2 molecule.
  • The dioxygen adduct exhibited reactivity towards phenols, including hydrogen-atom abstraction and acting as a base.

Conclusions:

  • Side-on coordinated superoxide species in copper complexes can be reactive intermediates.
  • This finding expands the understanding of copper-dioxygen chemistry.
  • The demonstrated reactivity suggests potential applications in oxidation catalysis.