κ³ -(N^C^C)Gold(III) Carboxylates: Evidence for Decarbonylation Processes

Area of Science:

• Organometallic Chemistry
• Coordination Chemistry
• Gold Chemistry

Background:

• Gold(III) carboxylates are important in catalysis and materials science.
• Understanding their reactivity and decomposition pathways is crucial for developing new applications.
• Existing knowledge on metallocarboxylic acid decomposition primarily focuses on decarboxylation.

Purpose of the Study:

• To synthesize and characterize novel Gold(III) carboxylate species.
• To investigate the reaction mechanism of ammonium hydroxide with a dinuclear gold precursor.
• To elucidate the thermal decomposition pathway of these new gold complexes.

Main Methods:

• Synthesis of dinuclear μ-CO2-κ3-(N^C^C)AuIII precursor.
• Nucleophilic attack using ammonium hydroxide.
• Characterization of the η1-AuIII-C(O)-OH species under cryogenic conditions.
• Analysis of thermal decomposition products.

Main Results:

• Successful synthesis and characterization of Gold(III) carboxylate species stabilized by a κ3-(N^C^C) ligand.
• Formation of a η1-AuIII-C(O)-OH species via nucleophilic attack.
• Observation of an unusual decarbonylation process during thermal decomposition, distinct from decarboxylation.

Conclusions:

• The study presents a new class of Gold(III) carboxylate complexes.
• A novel reaction pathway involving decarbonylation has been identified for these species.
• This finding expands the understanding of gold organometallic reactivity and decomposition mechanisms.