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β-Nitro-5,10,15-tritolylcorroles.

Manuela Stefanelli1, Giuseppe Pomarico, Luca Tortora

  • 1Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, 00133 Roma, Italy.

Inorganic Chemistry
|June 7, 2012
PubMed
Summary
This summary is machine-generated.

This study demonstrates a new method for nitrating corrole free bases, yielding regioselective mono- and dinitrocorrole derivatives. These functionalized corroles exhibit altered spectroscopic and redox properties due to nitro group conjugation.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Functionalization of corrole macrocycles, particularly at β-pyrrolic positions with nitro groups, is challenging for free bases due to instability under oxidative conditions.
  • Previous methods were limited to metallocorrolates, hindering the exploration of free base corrole properties.

Purpose of the Study:

  • To develop a method for regioselective nitration of corrole free bases.
  • To synthesize and characterize mono- and dinitrocorrole derivatives.
  • To investigate the impact of β-nitro substituents on corrole properties.

Main Methods:

  • Reaction of 5,10,15-tritolylcorrole (TTCorrH(3)) with the AgNO(2)/NaNO(2) system under controlled stoichiometry.
  • Regioselective synthesis of 3-nitro- and 3,17-dinitrocorrole isomers.
  • Structural characterization using X-ray crystallography.
  • Spectroscopic (UV-visible), electrochemical, and spectroelectrochemical analysis.
  • Computational studies using Density Functional Theory (DFT) and TD-DFT.

Main Results:

  • Successful synthesis of mono- and dinitrocorrole derivatives with controlled stoichiometry.
  • Regioselective formation of 3-nitro-TTCorrH(3) (53% yield) and 3,17-dinitro-TTCorrH(3) (20% yield).
  • Identification of other isomers and structural characterization via X-ray crystallography.
  • Demonstrated significant changes in spectroscopic and redox properties due to β-nitro group conjugation.
  • DFT/TD-DFT calculations closely matched experimental observations.

Conclusions:

  • A viable method for β-nitration of corrole free bases was established, overcoming previous limitations.
  • The β-nitro substituents significantly influence the electronic and optical properties of the corrole macrocycle through π-conjugation.
  • The position of the nitro group (2- vs. 3-position) affects conjugation efficiency and property modulation due to steric factors.