Bis(tetrelocenes) - fusing tetrelocenes into close proximity

Area of Science:

• Organometallic Chemistry
• Inorganic Chemistry
• Materials Science

Background:

• Bis(cyclopentadienyl) metal complexes, known as metallocenes, are crucial in catalysis and materials science.
• Exploring heavier group 14 elements (tetrels) in metallocene structures offers unique electronic and structural properties.

Purpose of the Study:

• To synthesize and characterize novel bis(germanocenes) and bis(stannocene) using unsymmetric ansa ligands.
• To investigate the energetic favorability of bis(tetrelocenes) compared to [1]tetrelocenophanes.
• To analyze the structural and electronic interactions within the synthesized bis(tetrelocenes).

Main Methods:

• Synthesis of bis(tetrelocenes) via reaction of unsymmetric ansa bis(cyclopentadienyl) ligands with germanium and tin dichlorides.
• Density Functional Theory (DFT) calculations to determine energetic preferences.
• X-ray crystallography for structural authentication.
• Natural Bond Orbital (NBO) and Atoms in Molecules (AIM) analyses for electronic interactions.

Main Results:

• Successful synthesis of two bis(germanocenes) and one bis(stannocene).
• DFT calculations confirmed that bis(tetrelocenes) formation is energetically favored over [1]tetrelocenophanes.
• Crystal structures revealed close proximity of tetrel(II) centers, indicating weak donor-acceptor interactions.

Conclusions:

• The study presents new bis(tetrelocenes) with potential applications in coordination chemistry and materials.
• The findings highlight the energetic preference for bis(tetrelocene) structures and the presence of intramolecular donor-acceptor interactions.
• This work expands the scope of organometallic chemistry involving heavier group 14 elements.