A novel charge-transfer complex of TTF having uracil moiety with TCNQ

A novel charge-transfer complex of tetrathiafulvalene (TTF) having uracil m oiety (TTFU), TTFU-TCNQ, was prepared by a cross coupling reaction of Bu3Sn =TTF and 5-iodouracil using Pd(0) catalyst. The TTFU=TCNQ complex was obtai ned by the mixing of equal molar quantities of DMF solution of TTFU and TCN Q. It exhibits a high electrical conductivity as the compressed pellet (rho (rt) = 9 Omega cm at room temperature) and shows semiconducting behavior ( E-a = 180 meV). From the magnetic susceptibility measurement. TTFU-TCNQ was found to have spin degrees of freedom, which suggests that it is not a ban d-type insulator but a Mott-Hubbard insulator.