Octaiodoporphyrin.

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Porphyrins are vital macrocyclic compounds with diverse applications.
• Synthesis of highly substituted porphyrins presents significant challenges.
• Iodinated porphyrins are of interest for their unique electronic and structural properties.

Purpose of the Study:

• To synthesize and characterize the first β-octaiodoporphyrin.
• To explore the coordination chemistry of the new porphyrin ligand.
• To investigate the structural and optical properties of its metal complexes.

Main Methods:

• Lindsey-type condensation reaction under optimized conditions at -10 °C.
• Synthesis of Ni, Cu, and Zn complexes of the β-octaiodoporphyrin ligand.
• Single-crystal X-ray diffraction analysis of the metal complexes.
• UV-Vis spectroscopy to determine optical properties.

Main Results:

• Successful synthesis of the first β-octaiodoporphyrin, H2[I8TpCF3PP].
• Formation of stable Ni, Cu, and Zn complexes.
• X-ray structure determination revealing a highly saddled porphyrin core in the zinc complex (Zn[I8TpCF3PP]).
• Zn[I8TpCF3PP] exhibits a dramatically red-shifted Soret absorption maximum at 495 nm.

Conclusions:

• The developed method allows for the synthesis of unprecedentedly iodinated porphyrins.
• The β-octaiodoporphyrin ligand forms stable metal complexes with unique structural features.
• The highly distorted porphyrin core significantly influences the electronic and optical properties, leading to red-shifted spectra.