A NMR spectroscopic study of some monothio-β-diketonate chelates and the corresponding β-diketones with a perfluoroethyl substituent

Abstract

The ¹³C and ¹⁹F NMR of nine metal complexes contained perfluoroethylmonothio-β-diketonate ligands are recorded in chloroform-d. The complexes are of the type M[RC(S)CHC(O)C₂F₅]_n where M is of nickel, palladium or cobalt; n is 2 or 3 and R is 2′-thienyl, phenyl or 2′-naphthyl. The ¹³C-NMR data support a fac-octahedral geometry for the cobalt complex (n=3). The ¹⁹F NMR show the chemical shift of the difluoromethylene group to be metal dependent. Correlations between the chemical shifts of the respective carbon resonances are also presented and NMR data for the three corresponding β-diketones, RC(OH) = CHC(O)C₂F₅, are described.