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The solid state structure of the long known but inadequately characterized compound, namely the mixed ligand copper(I) carbonyl trifluoroacetate, [Cu 2 (O 2 CCF 3 ) 2 (CO) 2 ] ( 1 ), has been determined by single crystal X-ray crystallography. Instead of the previously assigned tetranuclear core structure, its main building block is now confirmed to be a dinuclear copper(I) unit that is  cis -bridged by two trifluoroacetate ligands. The Cu · · · Cu separation within the unit is 3.1382(6) Å. Additionally, each copper center has one terminally bound carbonyl with a Cu–C distance of 1.806(3) Å. In the solid state,  1  displays a 1D chain structure comprised of the [Cu 2 ( μ  2 -O 2 CCF 3 ) 2 (CO) 2 ] units held by axial Cu · · · O interactions at 2.2181(13) Å.

In situ synthesis and crystal growth of copper(I) carbonyl trifluoroacetate: a dinuclear [Cu 2 (O 2 CCF 3 ) 2 (CO) 2 ] core structure confirmed