Synthesis and the structure of mixed carboxylatoplatinum(IV) complexes involving one trifluoroacetate ligand

Mono(trifluoroacetato)platinum(IV) complexes of the formula [PtIV(dach)L3(TFAc)] (dach = trans-(±)-1,2-diaminocyclohexane, TFAc = trifluoroacetate, L = acetate or propionate) could be prepared from the reaction of [PtIV(dach)L3(OH)] with trifluoroacetic anhydride in the presence of a base and the crystal structure of compound 4 was determined by X-ray crystallography. In vitro antitumor activity of complex 4 (ED50 = 3.1 μM) was found to be much higher than carboplatin (ED50 = 10.2 μM).