Electrophotographic photoconductor and diamine compounds for use in the same

An electrophotographic photoconductor comprising an electroconductive substrate and a photoconductive layer formed thereon comprising a diamine compound of formula (I):

• ##STR245## wherein R.sup.1 is an alkyl group having 1 to 4 carbon atoms, or an aryl group;
• R.sup.2 is hydrogen, an alkyl group having 1 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms;
• n is an integer of 1 to 3;
• and ##STR246## is an arylene group or a bivalent group of a heterocyclic compound, said photoconductive layer comprising said diamine compound, a sensitizer dye and a binder, or said photoconductive layer comprising a charge generating material and a charge transporting material which comprises said diamine compound and a binder.