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Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Radical Formation: Homolysis00:54

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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Radical Formation: Overview01:03

Radical Formation: Overview

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A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
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Radical Formation: Addition00:47

Radical Formation: Addition

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Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
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¹H NMR: Complex Splitting01:13

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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Molecular Orbital Theory II03:51

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Molecular Orbital Energy Diagrams
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Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
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An Open-Shell Singlet SnI  Diradical and H2  Splitting.

Mahendra K Sharma1, Dennis Rottschäfer1, Timo Glodde1

  • 1Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany.

Angewandte Chemie (International Ed. in English)
|January 18, 2021
PubMed
Summary
This summary is machine-generated.

Researchers synthesized the first tin(I) diradical, a novel 1,4-distannabenzene derivative. This tin diradical exhibits unique reactivity, including hydrogen molecule splitting at room temperature.

Keywords:
H2 splittingaromaticitydiradicaldistannabenzeneopen-shell systems

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Area of Science:

  • Organometallic Chemistry
  • Main Group Chemistry
  • Materials Science

Background:

  • Exploration of low-valent main group compounds is crucial for understanding unique bonding and reactivity.
  • Anionic dicarbene ligands offer versatile platforms for stabilizing unusual oxidation states in main group elements.
  • The synthesis and characterization of novel organotin compounds can lead to new materials and catalytic applications.

Purpose of the Study:

  • To synthesize and characterize the first tin(I) diradical stabilized by an anionic dicarbene ligand.
  • To investigate the electronic structure and aromaticity of the resulting tin-containing ring system.
  • To explore the reactivity of the novel tin(I) diradical, particularly its ability to cleave small molecules.

Main Methods:

  • Synthesis of the tin(I) diradical via KC8 reduction of a bis-chlorostannylene precursor.
  • Characterization using X-ray crystallography, DFT, and CASSCF calculations to determine electronic structure and diradical character.
  • Reactivity studies including hydrogen molecule splitting and reactions with electrophilic reagents (PhSeSePh, MeOTf).

Main Results:

  • Isolation of the first Sn(I) diradical, [(ADCPh)Sn]2, as a green crystalline solid.
  • The compound features a six-membered C4Sn2 ring exhibiting a diatropic ring current, classifying it as a 1,4-distannabenzene derivative.
  • Computational studies reveal an open-shell singlet ground state with a small singlet-triplet energy gap and significant diradical character (37%).
  • The tin(I) diradical readily cleaves H2 at room temperature, forming a bis-hydridostannylene.

Conclusions:

  • The successful synthesis and characterization of [(ADCPh)Sn]2 represent a significant advancement in the chemistry of low-valent organotin compounds.
  • The compound's 1,4-distannabenzene nature and diradical character open new avenues for exploring aromaticity and reactivity in main group chemistry.
  • The observed H2 splitting reactivity highlights the potential of this tin(I) diradical as a reagent in small molecule activation.