Among the various candidates of organic materials for optoelectronic applications [1],tetrathiafulvalene (TTF) is most attractive due to its excellent electron-donating properties.Because of the strong electron-donating property of TTF,its derivatives are usually sensitive to air and light,which is one of the main drawbacks of TTF for practical applications.In order to overcome this barrier,heterocycle has been annulated to synthesis a series 3,6-disubstituted monopyridazineannulated TTFs derivatives (Scheme 1).The properties of the conjugates have been studied experimentally by the combination of UV-vis spectroscopy (figure 1a) and electrochemistry (figure 1b).Their HOMO energy levels were estimated to be about -5.15 eV from cyclic voltammetry.The results suggest that present conjugates can be considered as candidates for hole transporting organic materials,such as semiconducting application.