Something germane about germanium: facile access to Ge₁₀ adamantane

Area of Science:

• Organometallic Chemistry
• Inorganic Chemistry
• Materials Science

Background:

• Adamantane structures offer unique cage-like frameworks with potential applications in materials science.
• Germanium-based clusters are of interest due to their unique electronic and structural properties.

Purpose of the Study:

• To synthesize a novel all-germanium adamantane derivative.
• To elucidate the reaction mechanism for the formation of germanium cage compounds.
• To characterize the molecular structures of the synthesized germanium adamantanes.

Main Methods:

• Multi-step synthesis starting from commercial germanium and silicon precursors.
• Sila-Wagner-Meerwein rearrangement for structural transformation.
• Single-crystal X-ray diffraction for molecular structure determination.
• Quantum-chemical calculations to support mechanistic proposals.

Main Results:

• Successful synthesis of the all-germanium adamantane (Me3SiGe)4(GeMe2)6 (2) from its isomer (Me3GeSi)4(GeMe2)6 (1).
• Structural confirmation of both isomers using single-crystal X-ray diffraction.
• Postulation of a plausible mechanistic pathway for the rearrangement.

Conclusions:

• The sila-Wagner-Meerwein rearrangement provides a viable route to all-germanium adamantane structures.
• The study expands the known family of germanium cage compounds.
• Computational analysis offers insights into the mechanism of cage rearrangement in organogermanium chemistry.