Three at a Time: Step by Step to Heterotermetallic Molecules

Area of Science:

• Inorganic Chemistry
• Materials Science
• Coordination Chemistry

Background:

• Ternary metal alkoxides present synthetic challenges due to statistical barriers and solution equilibria.
• Existing methods often favor bimetallic compound formation over desired termetallic structures.

Purpose of the Study:

• To demonstrate new synthetic strategies for creating novel structural motifs in ternary metal alkoxides.
• To overcome thermodynamic limitations and statistical barriers in the synthesis of termetallic alkoxides.

Main Methods:

• Utilized a tetradentate dimetalate unit, {M2(OiPr)9}- (M = Hf, Zr), to control metal coordination.
• Employed fast successive salt metathesis reactions for stepwise molecular construction.
• Investigated the synthesis of termetallic molecules with a central barium atom.

Main Results:

• Successfully synthesized novel termetallic alkoxide molecules, [{M'(OiPr)4}(HOiPr)Ba{M2(OiPr)9}] (M' = Al, Ga; M = Hf, Zr).
• Demonstrated a stepwise, rational construction approach that circumvents challenges in ternary metal alkoxide synthesis.
• Achieved, for the first time, gas-phase stable termetallic alkoxide frameworks.

Conclusions:

• The developed synthetic strategy enables the controlled assembly of complex termetallic alkoxide structures.
• This method provides a pathway to novel materials with unique properties and potential applications.
• The findings represent a significant advancement in the synthesis of multi-metal alkoxide compounds.