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5,10,15-Triferrocenylcorrole Complexes.

Giuseppe Pomarico1, Pierluca Galloni1, Federica Mandoj1

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Inorganic Chemistry
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Summary

Synthesizing ferrocenylcorrole complexes improved reaction yields. Unexpectedly, nickel insertion caused ring opening, yielding a linear tetrapyrrole nickel complex, while copper and cobalt complexes formed as expected.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Macromolecular Chemistry

Background:

  • Corroles are macrocyclic compounds with potential applications in catalysis and materials science.
  • Ferrocenyl groups can be incorporated into macrocycles to tune electronic and redox properties.

Purpose of the Study:

  • To synthesize and characterize metal complexes of 5,10,15-triferrocenylcorrole.
  • To investigate the effect of ferrocenyl group substitution on corrole complex properties.
  • To explore the reactivity of ferrocenylcorroles during metal insertion.

Main Methods:

  • Synthesis of 5,10,15-triferrocenylcorrole and its metal complexes (Cu, Co, Ni).
  • Spectroscopic characterization (NMR, UV-Vis, etc.), electrochemistry, and spectroelectrochemistry.
  • Density functional theory (DFT) calculations.

Main Results:

  • Successful synthesis of copper and triphenylphosphinecobalt 5,10,15-triferrocenylcorrole complexes.
  • Unexpected ring opening of the macrocycle upon nickel insertion, yielding a linear tetrapyrrole nickel complex.
  • Synthesis of copper complexes with varying ferrocenyl group numbers (mono- and di-substituted) to study substituent effects.

Conclusions:

  • Direct complexation enhances corrole stability and reaction yield.
  • Nickel insertion into ferrocenylcorroles can lead to macrocycle fragmentation.
  • The number and position of ferrocenyl groups significantly influence the spectroscopic and electrochemical properties of the metal complexes.