Langmuir-Blodgett (LB) films of a long-chain pyridinium-(TCNQ)2 salt (where TCNQ denotes tetracyanoquinodimethane), APT(8-12), exhibit a photoinduced conductivity change associated with the trans cis isomerization of the azobenzene group in the molecule. Recently the development of a one-dimensional (1D) columnar structure in the LB films of a similar long-chain pyridinium-(TCNQ)2 salt, C22PT, was indicated through quantitative analyses of the temperature-dependent spin susceptibility and the angular-dependent electron spin resonance line shape. The application of these methods to the APT(8-12) films has provided another example of a quasi-1D spin system realized in the LB film system.