Inorganic Compounds Containing the Trifluoroacetate Group

Publisher Summary Inorganic trifluoroacetates have been known for some 50 years, the first studies being completed by 8warts (247) in 1922. Trifluoroacetate derivatives have now been prepared for nearly all of the elements, the majority of them involving normal oxidation states, for example, there are a large number of trifluoroacetato complexes of chromium(III), nickel(II), copper(II), and tin(1V). Although simple electronegativity arguments would lead one to expect that this group could maintain its identity, when bonded to atoms in high oxidation states, this does not appear to be the case. Thus, no trifluoroacetato complexes of platinum(1V) or gold(II1) have been reported, and lead(1V) trifluoroacetate readily decomposes to the lead(I1) compound (192). Complexes involving the trifluoroacetate group coordinated to metal atoms in low oxidation states are, however, well known. For instance, (π-Cp)W(CO) 3 - (O 2 CCF 3 ) (57) Re(CO) 5 , (O 2 CCF 3 ) (57,137), and Ir(C0)( PPh 3 ) 2 (O 2 CCF 3 ,) (237 ) have been characterized, but clearly the carbonyl and the other ligands play the major role in stabilizing these low oxidation states.