In this study, we have synthesized eight novel compounds used as dyes for polyester fabrics. Benzene-1,4- diamine, 4-(4-aminophenoxy)benzenamine, 4-(4-aminophenylthio)benzenamine and 4-(4-aminophenylsul- fonyl)benzenamine were diazotized and coupled with malononitrile to give phenylazo malononitriles (1a-d). Then, including tetraminopyrazoles compounds (2a-d) were synthesized by heating phenylazo malononitriles and hydrazine monohydrate in ethanol. The compounds were characterized by FT-IR, NMR spectroscopic tech- niques (1H NMR, 13C NMR) and elementel analyses. UV-visible absorption spectra of the compounds are discus- sed (2a-d). The synthesized 1a-d and 2a-d were applied on polyester fabrics to investigated dyeing properties.