Crystalline Boragermenes.

Area of Science:

• Organometallic Chemistry
• Main Group Chemistry
• Boron-Germanium Compounds

Background:

• The synthesis of stable compounds featuring multiple bonds between heavier main group elements remains a significant challenge.
• Germanium-boron compounds are of interest due to their unique electronic structures and potential applications.

Purpose of the Study:

• To synthesize and characterize a novel compound containing a germanium-boron double bond (boragermene).
• To investigate the reactivity of the synthesized boragermene, particularly its interaction with Lewis bases and its response to hydrogenation.

Main Methods:

• Synthesis involved reacting a cyclic (alkyl)(boryl)germylene-PMe3 adduct with Cl2BN(SiMe3)2.
• Reductive dehalogenation using KC8 was employed to form the Ge=B bond.
• Characterization of the product and its adduct with a Lewis base (N-heterocyclic carbene) was performed.

Main Results:

• The first synthesis of boragermene (3) featuring a Ge=B double bond was achieved.
• Addition of a Lewis base resulted in an adduct (4) with double bond character between Ge and a tricoordinate B atom.
• Hydrogenation of boragermene (3) led to the cleavage of the Ge=B bond.

Conclusions:

• The successful synthesis of boragermene opens new avenues for exploring compounds with Ge-B multiple bonds.
• The reactivity studies demonstrate the unique chemical behavior of the Ge=B bond, including its susceptibility to hydrogenation.
• This work contributes to the fundamental understanding of bonding in heavier main group element compounds.