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Azo bond formation on metal surfaces.

Xiangzhi Meng1,2,3, Henning Klaasen4, Lena Viergutz4

  • 1Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Strasse 10, 48149, Münster, Germany.

Angewandte Chemie (International Ed. in English)
|November 16, 2020
PubMed
Summary
This summary is machine-generated.

On-surface chemistry enables the synthesis of azo compounds from nitroarenes and arylamines, overcoming solution-phase challenges. This method utilizes tailored precursors for efficient azo polymer formation on metal surfaces.

Keywords:
Azo formationSTMconjugated polymerscross-couplingsurface chemistry

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Area of Science:

  • Organic Chemistry
  • Surface Science
  • Materials Science

Background:

  • Azo compound formation via redox cross-coupling of nitroarenes and arylamines is difficult in solution.
  • On-surface chemistry offers a novel approach to overcome these limitations.

Purpose of the Study:

  • To achieve azo compound synthesis using on-surface redox cross-coupling.
  • To investigate the influence of metal surfaces on reaction efficiency.
  • To elucidate the reaction mechanism through experimental and computational studies.

Main Methods:

  • On-surface synthesis using well-designed precursors with nitro and amino functionalities.
  • Analysis of reaction products using cryogenic scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS).
  • Density Functional Theory (DFT) calculations to study the reaction mechanism.

Main Results:

  • Successful formation of azo polymers via highly efficient nitro-amino cross-coupling on surfaces.
  • Demonstrated significant effect of the metal substrate and its orientation on reaction efficiency.
  • Identified reaction pathway involving partially oxidized/reduced precursors in dimerization.

Conclusions:

  • On-surface chemistry provides an effective route for synthesizing azo compounds.
  • The choice of metal surface critically influences the efficiency of the nitro-amino cross-coupling reaction.
  • The study provides insights into the mechanism of on-surface azo compound formation.