Carbene Complexes of Stannocenes.
Carsten Müller1, Angelika Stahlich1, Lisa Wirtz1
1Faculty of Natural Sciences and Technology, Department of Chemistry , Saarland University , Saarbrücken 66123 , Federal Republic of Germany.
Inorganic Chemistry
|June 29, 2018
Summary
Researchers synthesized novel stannocene carbene complexes, revealing weak carbene-tin bonding due to dispersion forces. These reactive complexes are unstable at room temperature, impacting their potential applications.
Area of Science:
- Organometallic Chemistry
- Main Group Chemistry
Background:
- Metallocene carbene complexes are important in catalysis and materials science.
- Stannocene derivatives offer unique electronic and steric properties.
Purpose of the Study:
- To synthesize and characterize novel stannocene carbene complexes.
- To investigate the nature of the carbene-tin bond and complex stability.
Main Methods:
- Synthesis of stannocene carbene complexes (3a-3g).
- Characterization using NMR spectroscopy and single-crystal X-ray diffraction.
- Computational analysis using density functional theory (DFT).
Main Results:
- Successful synthesis of several stannocene carbene complexes.
- Weak coordination of N-heterocyclic carbenes to the tin atom, primarily driven by dispersion forces.
- Weakening of tin-cyclopentadienyl (Sn-Cp) bonds upon carbene coordination.
Conclusions:
- The synthesized stannocene carbene complexes exhibit high reactivity and short lifetimes at room temperature.
- The weak Sn-carbene bond is a key factor in their instability.
- These findings provide insights into the bonding and reactivity of organotin carbene complexes.
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