A three-coordinate iron-silylene complex stabilized by ligand-ligand dispersion forces

Area of Science:

• Organometallic Chemistry
• Inorganic Chemistry
• Computational Chemistry

Background:

• Iron amide complexes are important in catalysis and materials science.
• N-heterocyclic silyenes (NHSi) are versatile ligands in coordination chemistry.
• Understanding bonding and stability in low-coordinate complexes is crucial.

Purpose of the Study:

• To characterize the structural and bonding properties of a novel three-coordinate N-heterocyclic silyene (NHSi) iron(II) amide complex.
• To investigate the factors contributing to the stability of this unique complex.
• To explore the electronic interactions between the iron center and the silyene ligand.

Main Methods:

• Synthesis and characterization of the iron(II) amide complex.
• Density Functional Theory (DFT) calculations for structural and electronic analysis.
• Analysis of intermolecular and intramolecular bonding interactions.

Main Results:

• The iron(II) amide complex with a three-coordinate NHSi ligand was successfully synthesized and structurally characterized.
• Computational studies identified significant dispersion forces between amido and NHSi substituents as a key stabilizing factor.
• Strong iron-to-silicon (Fe-Si) π-backbonding was observed, contributing to the overall stability of the complex.

Conclusions:

• The stability of the reported iron(II) amide-NHSi complex is attributed to a combination of dispersion forces and Fe-Si π-backbonding.
• This work provides insights into the bonding nature of low-coordinate silylene complexes with transition metals.
• The findings contribute to the fundamental understanding of silylene ligand behavior in organometallic chemistry.