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An Isolable Diboron-Centered Diradical with a Triplet Ground State.

Lei Wang1, Yong Fang1, Haochuan Mao1

  • 1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 26, 2017
PubMed
Summary

Researchers synthesized novel diboranes and reduced them. One product, 32-.., is the first structurally characterized boron-centered diradical with a triplet ground state, confirmed by EPR and SQUID.

Keywords:
DFT calculationsEPRborondiradicaltriplet ground state

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Area of Science:

  • Organometallic Chemistry
  • Boron Chemistry
  • Radical Chemistry

Background:

  • Diboranes are compounds containing two boron atoms.
  • Understanding the electronic structure and reactivity of boron compounds is crucial in inorganic chemistry.
  • Exploration of novel boron-containing molecules can lead to new materials and catalytic applications.

Purpose of the Study:

  • To synthesize and characterize new diborane derivatives.
  • To investigate the reduction products of these diboranes.
  • To determine the electronic and magnetic properties of the reduced species, particularly focusing on radical character.

Main Methods:

  • Synthesis of 2,6-bis(BMes2 )mesitylene (1) and 3,3'-bis(BMes2 )bimesitylene (3).
  • Two-electron reduction using elemental potassium.
  • Structural characterization via X-ray crystallography.
  • Spectroscopic analysis including Electron Paramagnetic Resonance (EPR).
  • Magnetic susceptibility measurements using SQUID.
  • Theoretical calculations (DFT).

Main Results:

  • Isolation and characterization of C-H activation product from diborane 1.
  • Isolation and characterization of potassium-reduced species of diborane 3, [(18-c-6)K(THF)2 ]2+ ⋅32-...
  • Identification of 32-.. as a boron-centered diradical with a triplet ground state.
  • Confirmation of triplet ground state through EPR, SQUID, and theoretical calculations.
  • Demonstration of radical reactivity of 32-.. with PhSeSePh and nBu3 SnH.

Conclusions:

  • Successful synthesis and characterization of novel diboranes.
  • The reduction of diborane 3 yields a unique boron-centered diradical with a triplet ground state.
  • This discovery provides the first structural evidence for such a species.
  • The observed reactivity supports the diradical nature of 32-...