Azine-based dimeric charge transport materials

The present invention provides organophotoreceptors comprising an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising:(a) a charge transport material having the formula where R1, R2, R3, and R4 comprise, each independently, an alkyl group, an alkenyl group, an aromatic group, a heterocyclic group, or a part of a ring group; X and X' comprise, each independently, an aromatic group; Y and Y' comprise, each independently, a (disubstituted)methylene group; and Z is a linking group;(b) a charge generating compound; and(c) an electrically conductive substrate on which said charge transport material and said charge generating compound are located.Corresponding electrophotographic apparatuses, imaging methods, and charge transport materials are also described.