Studies of new organic conductors based on thiophene derived annulene complexes With TCNQF4

Two newly synthesized thiophene derived annulenes 1 and 2 have been studied as electron donors. Stable 1:1 complexes of them have been found with the electron acceptor TCNQF4. Their pressed-pellet room-temperature conductivities are 9.5×10−3S/cm for complex 1.TCNQF4, and 1.2×10−4S/cm for complex 2.TCNQF4. The temperature-dependent EPR (100 K - 300 K) reveals a narrow asymmetric line with g=2.0027 for both complexes, and low activation energies of 4.1 meV for 1.TCNQF4 and 9.7meV for 2.TCNQF4.