Rare antimony(III) imidazole selone complexes: steric controlled structural and bonding aspects

Area of Science:

• Coordination Chemistry
• Organometallic Chemistry
• Materials Science

Background:

• Imidazole selone ligands offer unique steric and electronic properties for metal complexation.
• Antimony(iii) halides are versatile precursors for synthesizing novel coordination compounds.
• Understanding ligand steric bulk effects is crucial for controlling coordination geometry and reactivity.

Purpose of the Study:

• To synthesize and characterize novel antimony(iii) imidazole selone complexes.
• To investigate the influence of ligand steric bulk on coordination modes and bonding.
• To explore the formation of Menshutkin-type Sb-aryl interactions in these complexes.

Main Methods:

• Synthesis of antimony(iii) imidazole selone complexes via reactions of antimony(iii) halides with bulky imidazole selone ligands.
• Structural characterization using single-crystal X-ray diffraction.
• Computational analysis using Density Functional Theory (DFT) to study electronic structure and bonding.

Main Results:

• Isolation of dinuclear antimony(iii) imidazole selone complexes with unusual coordination modes and Sb-Se bonds.
• Observation of Menshutkin-type Sb-aryl interactions in complexes with super-bulky ligands, absent in sterically less demanding systems.
• DFT calculations confirm experimental findings regarding bonding and electronic properties, showing good agreement with structural data.

Conclusions:

• The steric environment of imidazole selone ligands significantly dictates the coordination behavior and structural motifs of antimony(iii) complexes.
• Menshutkin-type interactions can be modulated by ligand design, offering pathways for tuning complex properties.
• These findings advance the understanding of coordination chemistry involving bulky ligands and antimony(iii) centers.