CRYSTAL-STRUCTURE AND ELECTRONIC-PROPERTIES OF AN ORGANIC ION-RADICALSALT - ETHYL-4,4'-DIMETHYL-2,2'-THIAZOLOCYANINE-[TCNQ](2)

An organic ion-radical salt, thyl-4,4'-dimethyl-2,2'-thiazolocyanine-[ TCNQ](2), is synthesized and its crystal structure and electronic prop erties are investigated. The salt forms triclinic crystal in the space group P (1) over bar with alpha=13.153(4), b=18.314(5), c=7.792(2)Ang strom, alpha=107.21(3), beta=103.60(4), gamma=77.75(3)degrees and Z=2. The electric conduction of single crystals is anisotropic and shows s emiconductive temperature dependence. The intrinsic spin-susceptibilit y of the salt shows a broad maximum around 265 K and decreases to zero below 15 K. A single ESR absorption is observed for a single crystal and its linewidth strongly depends on the temperature and the directio n of external magnetic field. These electronic properties are discusse d on the basis of the peculiar crystal structure of the sail.