LITHIUM-SALTS OF SF5 ALKYLSULFONIC ACIDS - SYNTHESIS, CHARACTERIZATION AND CONDUCTIVITY

The lithium sulfonates, SF5CFHSO3Li (1) and SF5CF2SO3Li (2), were prep ared by reaction of the corresponding sulfonyl fluorides SF(5)CFXSO(2) F (X = H or F) with lithium hydroxide. The product identities were con firmed by IR and NMR spectroscopies, MS and elemental analysis, and th e thermal stabilities were determined via DSC and TGA. The poly (ethyl ene oxide) (PEG) -saltcomplexes, PEO(x)LiSO(3)CFHSF(5) (3), were prepa red for x=2 to 16 (where x=O/Li mole ratio) and the bulk conductivitie s measured between 40 degrees C and 120 degrees C. Unlike the PEO(x)Li SO(3)CF(2)SF(5) (4) complexes, thermal and conductivity measurements d o not indicate a plasticizing effect for these complexes; these observ ations are discussed in terms of hydrogen bonding between SF5CFHSO3- a nions.