Polymers having 2,5-diphenyl-1,3,4-oxadiazole (BCO) or anthracene (BCA) as an electron transport unit and N,N '-diphenyl-N,N '-bis(4-butylphenyl)-benzidine (BTPD) as a hole transport unit were prepared by condensation polymerization using Friedel-Crafts reaction. It was found that BCO was less reactive than BCA. The low reactivity of the BCO monomer can be explained by the oxygen atom in the oxadiazole unit, which acts as a Lewis base and reduces the activity of the catalyst. The redox behavior measured by cyclic voltammetry showed for both BTPD-BCO and BTPD-BCA almost the same oxidation potential. In addition, the BTPD-BCO also exhibited a reduction peak. Hole and electron drifts mobility of the polymers were measured by the time-of-flight method. The hole drift mobility of both BTPD-BCO and BTPD-BCA was 7.4 X 10(-5) cm(2) V-1 s(-1). The electron drift mobilities of BTPD-BCO and BTPD-BCA were 6.5 X 10(-5) cm(2) V-1 s(-1) and 5.2 X 10(-6) cm(2) V-1 s(-1), respectively. (c) 2007 Wiley Periodicals, Inc.