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Synthesis and Characterization of a π-Extended Clar's Goblet.

Shantanu Mishra1,2, Manuel Vilas-Varela3, Igor Rončević4

  • 1Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden.

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|October 20, 2025
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Researchers synthesized a π-extended Clar's goblet, a tetraradical concealed non-Kekulé polybenzenoid hydrocarbon. This molecule has potential applications in organic spintronics due to its open-shell ground state.

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Area of Science:

  • Organic chemistry
  • Materials science
  • Quantum chemistry

Background:

  • Concealed non-Kekulé polybenzenoid hydrocarbons possess open-shell ground states, making them promising for organic spintronics.
  • These molecules are rare and challenging to synthesize, with Clar's goblet (C38H18) being a notable example.
  • The synthesis of such complex hydrocarbons is crucial for advancing molecular electronics.

Purpose of the Study:

  • To synthesize a π-extended Clar's goblet (C76H26), a tetraradical concealed non-Kekulé polybenzenoid hydrocarbon.
  • To characterize the synthesized molecule on a surface using advanced microscopy techniques.
  • To investigate the electronic properties and ground state of this novel molecule through computational methods.

Main Methods:

  • Combined in-solution and on-surface synthesis approach.
  • Low-temperature scanning tunneling microscopy (STM) and atomic force microscopy (AFM) for molecular characterization.
  • Mean-field and multiconfigurational quantum chemistry calculations for electronic property analysis.

Main Results:

  • Successful synthesis of a π-extended Clar's goblet (C76H26).
  • Characterization of individual molecules adsorbed on a Cu(111) surface.
  • Insights into the many-body nature of the ground and excited states of the tetraradical molecule.

Conclusions:

  • The study reports the synthesis and characterization of a novel tetraradical concealed non-Kekulé polybenzenoid hydrocarbon.
  • The findings provide a deeper understanding of the electronic properties of these elusive molecules.
  • This work opens avenues for the design and application of novel materials in organic spintronics.