DEPENDENCE ON THE SUBSTITUENTS OF THE PHO TOCONDUCTION FROM ARYLAMINES

Aromatic amines are often used as charge transporting agents in electr ophotographic two-layer-systems. Structure-property-relations of this substance class are discussed on the basis of homogeneously sensitized polycarbonat-layers containing derivatives of anilines. Substituent v ariation of the actinic compounds has a significant influence on the e lectrophotographic sensitivity. Correlations between Hammett substitue nts constants and electrophotographic sensitivity are useful for the p reselection of arylamin structures. Dibenzylamino groups lie out of th ese correlations and induce an unexpected high photoconductivity. This fact was investigated by cyclovoltammetric measurements of 22 various dibenzylanilines. Low half-peakpotentials and reversible one-electron oxidation steps of dibenzylanilines are necessary for outstanding pho toconductor properties.