Structural characterization of the μ-Nitrido Complex {[Fe(OEP)]₂N}

Area of Science:

• Inorganic Chemistry
• Coordination Chemistry
• Structural Chemistry

Background:

• The study of metal-nitrido complexes is crucial for understanding nitrogen fixation and catalysis.
• Octaethylporphyrin (OEP) ligands are widely used in coordination chemistry due to their stability and electronic properties.

Purpose of the Study:

• To report the precise molecular structure of the μ-nitrido dimer, μ-nitrido-bis(2,3,7,8,12,13,17,18-octaethylporphyrinato)iron.
• To analyze the iron-nitrogen bond distances and the electronic state of the iron centers.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the molecular structure.
• Analysis of bond lengths and angles provided insights into the electronic configuration.

Main Results:

• The axial Fe-N bond distances average 1.657 Å, and equatorial distances average 2.005 Å.
• The two iron centers were found to be equivalent, suggesting a low-spin state and a formal oxidation state of +3.5.
• The structure was compared with other known nitrido-bridged species.

Conclusions:

• The determined structure provides a detailed understanding of the bonding in this specific iron nitrido dimer.
• The findings contribute to the broader knowledge of metal-nitrido complexes and their electronic properties.