CONDUCTING CHARGE-TRANSFER SALTS BASED ON NEUTRAL PI-RADICALS

MOST molecular conductors rely on charge transfer to create carriers. For example, the ET salts1 are hole-doped whereas the C60 salts2 are e lectron-doped. Neutral radical species in which bands are formed by pi -orbital overlap would be expected to have half-filled bands and thus to be conducting3, but no such metals have yet been reported. Here we report the synthesis and characterization of a molecular conductor whi ch combines both of these approaches: energy bands are formed from one -dimensional stacks of neutral pi-radicals, and the material is render ed conducting by electron transfer from the conduction band following doping with an acceptor. The radical species is the 1,4-phenylene-bis( dithiadiazolyl) diradical 1,4-[(S2N2C)C6H4(CN2S2)] (2 in Fig. 1), reac tion of which with iodine vapour leads to crystals of [2][I]. At low t emperatures this compound is essentially a diamagnetic insulator, but above 200 K the conductivity and magnetic susceptibility increase mark edly, and at room temperature the conductivity reaches 100 S cm-1, whi ch is comparable to that shown by conventional molecular charge-transf er salts.