Influence of Substituents in the Solid State of Radical Cations of Two Phenothiazine Derivatives

The optical, EPR and magnetic susceptibility of the cation radicals of two phenothiazine derivatives have been investivated as a function of R2 and R10 substituents. We have tried to relate all of the above with the conductivity of these compounds and their slight dependence of the conductivity on the temperature. The diffuse reflectance spectra show a charge transfer between 600 adn 1200 nm. This CT band shows the R2 and R10 substituents influence. The EPR shows the existence of the radical cation and the dependence of the bandwidth on the R10 subsituents. X static measurements give different quantities of free unparied electrons on each radical in the solid state, also related to the R10 substituents.