Isolation and Reactivity of a Square-Planar Trisamido Silane

Area of Science:

• Inorganic Chemistry
• Organosilicon Chemistry
• Coordination Chemistry

Background:

• Square-planar coordination geometry is highly disfavored for tetravalent silicon (Si(IV)).
• Structurally authenticated Si(IV) complexes with this geometry are exceptionally rare in chemical literature.

Purpose of the Study:

• To synthesize and characterize a novel square-planar Si(IV) hydride complex.
• To investigate the electronic structure and bonding characteristics of the resulting complex.
• To explore the reactivity and catalytic potential of this unique silicon complex.

Main Methods:

• Synthesis of a novel unsymmetric, trianionic N,N,N-pincer ligand with a dearomatised backbone.
• Isolation and characterization of the square-planar Si(IV) hydride complex.
• Structural authentication using single-crystal X-ray diffraction.
• Spectroscopic analysis (e.g., NMR, IR) and quantum-chemical calculations to confirm the bonding motif.

Main Results:

• Successful synthesis and isolation of a strictly planar, four-coordinate Si(IV) hydride.
• Experimental and computational data confirm the square-planar coordination geometry at silicon.
• Demonstration of element-ligand cooperative substrate activation facilitated by ligand rearomatisation.

Conclusions:

• The study reports the first structurally authenticated square-planar Si(IV) hydride complex.
• This finding challenges the conventional understanding of silicon coordination chemistry.
• The observed reactivity parallels constant-oxidation-state transformations in transition metal catalysis, suggesting new possibilities for p-block element catalysis.