Properties of the organic conductor (TMTSF)2Ni(tht)2; relation to the metal bis-diselenolate analogues

The preparation of (TMTSF)2Ni(tht)2, tht=thiete or [bis(trifluoromethyl)ethylene]dithiolate, single crystals and their preliminary characterization by electrical resistivity, thermopower, EPR and magnetic susceptibility are reported. The transport properties indicate a metallic behaviour at high temperatures (σRT≈50 S/cm, SRT=1 μV/K) and a metal to insulator transition at 69 K. The overall behaviour is similar to that previously reported for the β-phase of the selenium analogues (TMTSF)2M(tds)2, M=Ni and Pt.