Hydrazone-based charge transport materials having an unsaturated acyl group

An electrophotographic imaging apparatus comprising:

• (a) a light imaging component;
• and
• (b) an organophotoreceptor oriented to receive light from the light imaging component, the organophotoreceptor comprising an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising:
• (i) a charge transport material having the formula
• where Ar comprises an aromatic group;
• X comprises a bond or a linking group, wherein X further comprises a —(CH2)n— group, where n is an integer between 1 and 20, inclusive, and one or more of the methylene groups is optionally replaced by O, S, N, C, B, Si, P, C═O, O═S═O, a heterocyclic group, an aromatic group, an NRa group, a CRb group, a CRcRd group, a SiReRf group, a BRg group, or a P(═O)Rh group, where Ra, Rb, Rc, Rd, Re, Rf, Rg, and Rh are, each independently, a bond, H, a hydroxyl group, a thiol group, a carboxyl group, an amino group, a halogen, an alkyl group, an acyl group, an alkoxy group, an alkylsulfanyl group, an alkenyl group, an alkynyl group, a heterocyclic group, an aromatic group, or a part of a ring group;
• and
• R1, R2, R3, R4, and R5 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, a heterocyclic group, or a part of a ring group;
• and
• (ii) a charge generating compound.

A charge transport material having the formula

• where Ar comprises an aromatic group;
• X comprises a bond or a linking group, wherein X comprises a —(CH2)n— group, where n is an integer between 1 and 20, inclusive, and one or more of the methylene groups is optionally replaced by O, S, N, C, B, Si, P, C═O, O═S═O, a heterocyclic group, an aromatic group, an NRa group, a CRb group, a CRcRd group, a SiReRf group, a BRg group, or a P(═O)Rh group, where Ra, Rb, Rc, Rd, Re, Rf, Rg, and Rh are, each independently, a bond, H, a hydroxyl group, a thiol group, a carboxyl group, an amino group, a halogen, an alkyl group, an acyl group, an alkoxy group, an alkylsulfanyl group, an alkenyl group, an alkynyl group, a heterocyclic group, an aromatic group, or a part of a ring group;
• and
• R1, R2, R3, R4, and R5 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, a heterocyclic group, or a part of a ring group.