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Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Resonance02:52

Resonance

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds. 
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
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The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
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Nitrosation of Enols01:19

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The nitrosation reaction is one of the methods of preparing 1,2-diketones. The enol tautomer of the starting ketone reacts with sodium nitrite in hydrochloric acid, generating the 1,2-diketone after hydrolysis.
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Re(i)-nitroxide complexes.

Kseniya Maryunina1, Gleb Letyagin1,2, Artem Bogomyakov1,2,3

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Summary
This summary is machine-generated.

Spin-labeled cyrhetrenes, including nitronyl nitroxide (NNCp) and imino nitroxide (INCp) derivatives, show promise as multifunctional contrast agents due to their kinetic stability and tunable magnetic properties.

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Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps
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Area of Science:

  • Organometallic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Spin-labeled organometallic compounds offer unique magnetic and electronic properties.
  • Cyrhetrenes, specifically cyclopentadienyl-rhenium tricarbonyl complexes, are known for their stability.
  • Nitroxide radicals are versatile paramagnetic moieties for magnetic studies and applications.

Purpose of the Study:

  • To synthesize and characterize novel spin-labeled cyrhetrenes, namely nitronyl nitroxide (NNCp) and imino nitroxide (INCp) derivatives.
  • To investigate the relationship between the arrangement of paramagnetic centers and magnetic exchange interactions in different polymorphs.
  • To evaluate the potential of these compounds as multifunctional contrast agents.

Main Methods:

  • Synthesis of spin-labeled cyrhetrene complexes.
  • Characterization using Electron Paramagnetic Resonance (EPR), Cyclic Voltammetry (CV), X-ray Diffraction (XRD), magnetochemistry, and quantum chemistry calculations.
  • Analysis of magnetic exchange interactions in polymorphs of [(NNCp)Re(CO)3].

Main Results:

  • Successful synthesis and characterization of [(NNCp)Re(CO)3] and [(INCp)Re(CO)3] complexes.
  • Detailed study of magnetic exchange interactions in three polymorphs of [(NNCp)Re(CO)3], correlating paramagnetic center arrangements with magnetic behavior.
  • Demonstration of high kinetic stability for the nitroxide-substituted cyrhetrenes.

Conclusions:

  • Nitroxide-substituted cyrhetrenes exhibit high kinetic stability, a crucial property for advanced materials.
  • These compounds possess tunable magnetic properties influenced by the arrangement of paramagnetic centers.
  • The promising features suggest their potential for developing novel multifunctional contrast agents.