The properties of 5 highly conducting salts - (TMTSF)₂X,X=PF₆^-, AsF₆^-, SbF₆^-, BF₄^- and NO₃^-, derived from tetramethyltetraselenafulvalene (TMTSF)

The properties of five new highly conducting salts of TMTSF, (TMTSF)2X, X = PF6-, AsF6-, SbF6-, BF4- and NO3- are reported. The measurements include dc. and M.W. conductivity, thermopower, optical reflectivity, magnetic susceptibility and F-19-NMR. Preliminary structural data indicate uniform donor stacks.

Metal to insulator transitions in four materials occur below 20 K, where specific conductivities higher than 10(5) (OMEGA-cm)-1 are observed for two salts (X = PF6- and NO3-).