Pyrazino-fused organic conductors, CnDTP-TTF and CwDTP-STF (n = 5,6)

We have obtained several charge-transfer complexes of CnDTP-TTF (n = 5,6). The C5DTP-TTF salts are the κ-type semiconductor with high room-temperature conductivities, whereas β′′-(C6DTP-TTF)2(GaCl4)0.66 shows the metallic behavior down to 40 K. In order to improve the conductivity by increasing the bandwidth, we have applied a pressure and synthesized a series of the selenium analogues, CnDTP-STF (n = 5,6). In this report, crystal structures and conducting behaviors of CnDTP-TTF salts, and the attempt of increasing the bandwidths are described.