Azine-based dimeric charge transport materials

An electrophotographic imaging apparatus comprising:

• (a) a light imaging component;
• and
• (b) an organophotoreceptor oriented to receive light from said light imaging component, said organophotoreceptor comprising:
• (i) 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;
• (ii) a charge generating compound;
• and
• (iii) an electrically conductive substrate on which said charge transport material and said charge generating compound are located.

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.