Stickstoffdioxid und die isoelektronische COOH-Gruppe als 5-Elektronendonoren in Carbonylmetallkomplexen; Herstellung und Charakterisierung der ersten ”Metallacarbonsäure„

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

Gold(III) carboxylate species, stabilized by a κ³ -(N^C^C) ligand template, are presented herein. A η¹ -Au^III -C(O)-OH species has been characterized under cryogenic conditions as a result of the nucleophilic attack of an ammonium hydroxide onto a dinuclear μ-CO₂ -κ³ -(N^C^C)Au^III precursor. Thermal decomposition for these species proceeds by an unusual decarbonylation process, in contrast to typical decarboxylation pathways observed in related metallocarboxylic acids.

Utilisation of CO2 as a chemical feedstock: opportunities and challenges

The need to reduce the accumulation of CO(2) into the atmosphere requires new technologies able to reduce the CO(2) emission. The utilization of CO(2) as a building block may represent an interesting approach to synthetic methodologies less intensive in carbon and energy. In this paper the general properties of carbon dioxide and its interaction with metal centres is first considered. The potential of carbon dioxide as a raw material in the synthesis of chemicals such as carboxylates, carbonates, carbamates is then discussed. The utilization of CO(2) as source of carbon for the synthesis of fuels or other C(1) molecules such as formic acid and methanol is also described and the conditions for its implementation are outlined. A comparison of chemical and biotechnological conversion routes of CO(2) is made and the barriers to their exploitation are highlighted.