N-alkyl-2-aminopyridinium halides (1) were obtained by reacting 2-aminopyridine with alkyl halides. 1:1(simple salt) and 1:2 (double salt) ion radical type charge transfer completes were formed by reacting 1 with 7,7,8,8-tetracyanoquinodimethane (TCNQ) or LiTCNQ. UV, ESR and electric conductivities of these charge transfer completes were measured:Ftperimontal results showed that 1:2 completes were formed in acetonitrile instead of 1:1 completes. In the case of large alkyl groups such as butyl and amyl groups, crystals of 1:2 completes were formed with difficulty, probably due to the steric hindrance effect. The size of alkyl groups has great influence on the electric conductivity of the charge transfer completes formed.