Metal-Translocation-Coupled Ligand-Binding/Release by Dinuclear Rhodium Sandwich Complexes

Area of Science:

• Organometallic Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• The dynamic control of metal atom positions within molecules is crucial for developing advanced molecular machines.
• Understanding metal-ligand interactions is key to designing responsive molecular systems.

Purpose of the Study:

• To demonstrate reversible metal translocation coupled with ligand binding/release in organometallic complexes.
• To investigate the mechanism of metal-assembly and disassembly in response to external stimuli.

Main Methods:

• Synthesis and characterization of rhodium-arylpolyene complexes.
• Investigation of metal migration using Nuclear Magnetic Resonance (NMR) spectroscopy.
• Structural elucidation of different states using X-ray diffraction analysis.

Main Results:

• Observed reversible migration of rhodium moieties between arene and olefin sites within arylpolyene ligands.
• Demonstrated that metal assembly and disassembly are triggered by the association and dissociation of bridging and non-bridging ligands.
• Confirmed ligand-induced oxidative π-addition for non-bridging ligands.

Conclusions:

• Reversible metal translocation can be effectively coupled to ligand-binding events in organometallic complexes.
• This controllable metal movement provides a mechanism for dynamic molecular assembly and disassembly.
• The findings offer new strategies for designing responsive and adaptive molecular machines.