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Related Concept Videos

Redox Reactions01:24

Redox Reactions

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...
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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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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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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...
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Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
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Nitrite reduction by copper complexes.

John G Woollard-Shore1, Jason P Holland, Michael W Jones

  • 1Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, United Kingdom OX1 3TA.

Dalton Transactions (Cambridge, England : 2003)
|January 28, 2010
PubMed
Summary
This summary is machine-generated.

New copper complexes show promise for catalytic nitrite anion reduction. Their performance in converting nitrite to nitrogen oxides correlates with electrochemical reduction potential, warranting further study.

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Area of Science:

  • Inorganic Chemistry
  • Catalysis
  • Electrochemistry

Background:

  • Nitrite anions pose environmental and health concerns.
  • Developing efficient catalysts for nitrite reduction is crucial.

Purpose of the Study:

  • To synthesize and characterize novel copper complexes as potential catalysts for nitrite anion reduction.
  • To investigate the catalytic activity and efficiency of these complexes.

Main Methods:

  • Synthesis and characterization of copper complexes using X-ray crystallography, NMR, mass spectrometry, and IR spectroscopy.
  • Electrochemical studies including cyclic voltammetry.
  • Density functional theory (DFT) calculations.
  • Catalytic testing for nitrite anion conversion.

Main Results:

  • Copper complexes with simple aliphatic substituents were synthesized and characterized.
  • A strong correlation was observed between catalytic conversion rates and experimental reduction potentials.
  • The complexes exhibited varied catalytic turnover rates, yields, and product gas compositions.

Conclusions:

  • The synthesized copper complexes are effective catalysts for nitrite anion reduction.
  • Electrochemical properties are key indicators of catalytic performance.
  • Further research into copper-based nitrite reduction catalysts is recommended.