Structure and properties of SMEO-ST-TTP salts

Several radical cation salts based on SMEO-ST-TTP and SMEO-TTP have been prepared. X-Ray structure analyses reveal that (SMEO-ST-TTP) 2 PF 6 has the so-called β-type donor packing, in which the donors are strongly dimerized in a stack. On the other hand, (SMEO-ST-TTP)Au(CN) 2 and (SMEO-TTP)Au(CN) 2 have strongly dimerized one-dimensional stacking structure. The PF 6 - and AsF 6 - salts based on SMEO-ST-TTP show metallic conductivity down to 22 and 90 K, respectively, below which resisitivity increases a little.