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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...
Formation of Complex Ions03:45

Formation of Complex Ions

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...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

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,...
Structural Isomerism02:34

Structural Isomerism

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 be...
Rate-Determining Steps03:08

Rate-Determining Steps

Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...

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Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Selective nitrite reduction at heterobimetallic CoMg complexes.

Christopher Uyeda1, Jonas C Peters

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

Journal of the American Chemical Society
|July 20, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces novel heterobimetallic cobalt-magnesium complexes that mimic nitrite reductase activity. These complexes selectively catalyze nitrite reduction to nitrous oxide, offering a new pathway for nitrogen compound transformation.

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Area of Science:

  • Bioinorganic Chemistry
  • Catalysis
  • Coordination Chemistry

Background:

  • Heme-containing nitrite reductases utilize Brønsted acidic residues for nitrite activation.
  • Synthetic models are needed to understand and replicate these enzymatic functions.
  • Lewis acidic sites are crucial for modeling nitrite reductase activity.

Purpose of the Study:

  • To synthesize and characterize heterobimetallic cobalt-magnesium complexes.
  • To model the nitrite binding and activation mechanism of nitrite reductases.
  • To evaluate the catalytic competence of these complexes in nitrite reduction.

Main Methods:

  • Synthesis of heterobimetallic CoMg complexes supported by diimine-dioxime ligands.
  • Redox titrations and spectroscopic analysis of nitrite adducts.
  • Electrochemical studies including bulk electrolysis for catalytic evaluation.

Main Results:

  • A neutral (μ-NO2)CoMg species and a redox series of nitrite adducts were synthesized.
  • Proton-induced N-O bond heterolysis of bound nitrite was achieved.
  • Selective reduction of nitrite to nitrous oxide (N2O) was demonstrated electrochemically.

Conclusions:

  • The synthesized CoMg complexes effectively model key aspects of nitrite reductase function.
  • These complexes demonstrate selective catalytic conversion of nitrite to N2O.
  • This work provides insights into synthetic strategies for nitrogen compound catalysis.