ABSTRACT. Two diamide derivatives, coded as TPPA-(TPA)2 and TPPA-(NPC)2, containing N,N,N',N'-tetraphenyl-1,4-phenylenediamine (TPPA) centers and triphenylamine (TPA) or N-phenylcarbazole (NPC) terminal groups were synthesized. The electrochemical coupling reactions of the triphenylamine and carbazole end-groups produce the electroactive polymer film directly on the surface of the ITO/glass electrode from these two diamide compounds in the electrolyte. The electro-generated polymer films showed reversible redox behavior, multi-colored electrochromism, high coloration efficiency, and good cycling stability. Single-layer electrochromic devices using the electrodeposited polymer films as active layers were fabricated and tested as preliminary investigation for their electrochromic applications.