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Highly Robust and Antiaromatic Rhenium(I) Rosarin.

Xiaojuan Lv1, Hu Gao2, Fan Wu2

  • 1School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China.

Inorganic Chemistry
|March 15, 2023
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Summary
This summary is machine-generated.

A new rhenium(I) complex, 1ReH•Cl, exhibits antiaromatic properties in its ground state, confirmed by NMR and DFT. Its T1 state, however, becomes aromatic according to Baird

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Area of Science:

  • Organometallic Chemistry
  • Photochemistry
  • Theoretical Chemistry

Background:

  • Rhenium(I) complexes are crucial in catalysis and photophysics.
  • Understanding antiaromaticity in metal complexes is key to designing novel electronic materials.
  • Triarylrosarin ligands offer unique electronic and structural properties.

Purpose of the Study:

  • To synthesize and characterize a novel rhenium(I) complex with a triarylrosarin ligand.
  • To investigate the electronic and photophysical properties of the synthesized complex, focusing on its aromaticity.
  • To explore the redox behavior and structural features influencing its electronic state.

Main Methods:

  • Synthesis of the rhenium(I) complex 1ReH•Cl.
  • Characterization using 1H NMR spectroscopy and density functional theory (DFT) calculations.
  • Electrochemical studies including cyclic voltammetry and UV-Vis spectroelectrochemistry.
  • X-ray crystallography for structural determination.
  • Analysis of spin-density distributions and magnetic field-dependent calculations (NICS, ICSS).

Main Results:

  • 1ReH•Cl was successfully synthesized and exhibits robust antiaromatic character in its ground state, evidenced by NMR spectroscopy and DFT.
  • The complex displays broad absorption from UV to near-IR, with its rosarin backbone undergoing redox chemistry.
  • X-ray structure reveals a protonated inner cavity preventing proton-coupled electron transfer.
  • Baird's rule predicts aromaticity in the T1 excited state, supported by negative NICS(0) values and current density maps.

Conclusions:

  • The synthesized rhenium(I) complex 1ReH•Cl is a stable antiaromatic compound.
  • Its electronic properties are tunable, showing redox activity and a transition to aromaticity in the T1 state.
  • This study provides insights into the design of novel antiaromatic organometallic compounds with potential applications in materials science.