Generalizing metallocene mechanochemistry to ruthenocene mechanophores

Area of Science:

• Organometallic Chemistry
• Polymer Science
• Mechanochemistry

Background:

• Ferrocene exhibits unique force-free stability and mechanochemical activity, acting as a preferred site for polymer chain scission.
• This raises questions about mechanochemical potential in other metallocenes and the factors governing their behavior as mechanophores.

Purpose of the Study:

• To develop polymerization methods for main-chain ruthenocene-based polymers.
• To investigate the mechanochemistry of ruthenocene and compare it with ferrocene.

Main Methods:

• Synthesis of main-chain ruthenocene-containing polymers.
• Mechanochemical testing to identify sites of polymer chain scission.
• Comparative analysis of ruthenocene and ferrocene reactivity.

Main Results:

• Ruthenocene, similar to ferrocene, selectively cleaves polymer backbones under mechanical force.
• Ruthenocene demonstrates high selectivity as a mechanophore despite its inherent inertness.
• Comparative reactivity data offer insights into structural and thermodynamic influences on metallocene mechanochemistry.

Conclusions:

• Metallocenes can serve as privileged mechanophores, enabling dynamic behavior in otherwise inert coordination complexes.
• Potential applications include stimuli-responsive materials and mechanochemical synthesis of challenging reactive intermediates.