Charge transport materials having a central disulfane linkage

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 Y1 and Y2 comprise, each independently, an aromatic group;
• X1 and X2 are, each independently, a linking group;
• W1 and W2 are, each independently, a —(CH2)n— group or a —(CH2)n-1—C(═O)— group, where n is an integer between 1 and 10, inclusive;
• Ar1 and Ar2 comprise, each independently, a divalent aromatic group;
• Q1 and Q2 are, each independently, O, S, or NR;
• Z1 and Z2 comprise, each independently, a bond, a vinyl group, a —CR1═N—NR2— group, or a —CR3═N—N═CR4— group;
• and
• R, R1, R2, R3, and R4 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an acyl group, a heterocyclic group, or an aromatic group;
• and
• (ii) a charge generating compound.

An electrophotographic imaging process comprising;

• (a) applying an electrical charge to a surface of an 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 Y1 and Y2 comprise, each independently, an aromatic group;
• X1 and X2 are, each independently, a linking group;
• W1 and W2 are, each independently, a —(CH2)n— group or a —(CH2)n-1—C(═O)— group, where n is an integer between 1 and 10, inclusive;
• Ar1 and Ar2 comprise, each independently, a divalent aromatic group;
• Q1 and Q2 are, each independently, O, S, or NR;
• Z1 and Z2 comprise, each independently, a bond, a vinyl group, a —CR1═N—NR2— group, or a —CR3═N—N═CR4— group;
• and
• R, R1, R2, R3, and R4 comprise, each independently, H, an aikyl group, an alkenyl group, an alkynyl group, an acyl group, a heterocyclic group, or an aromatic group;
• and
• (ii) a charge generating compound.
• (b) imagewise exposing the surface of the organophotoreceptor to radiation to dissipate charge in selected areas and thereby form a pattern of charged and uncharged areas on the surface;
• (c) contacting the surface with a toner to create a toned image;
• and
• (d) transferring the toned image to substrate.

A charge transport material having the formula

• where Y1 and Y2 comprise, each independently, an aromatic group;
• X1 and X2 are, each independently, a linking group;
• W1 and W2 are, each independently, a —(CH2)n— group or a —(CH2)n-1—C(═O)— group, where n is an integer between 1 and 10, inclusive;
• Ar1 and Ar2 comprise, each independently, a divalent aromatic group;
• Q1 and Q2 are, each independently, O, S, or NR;
• Z1 and Z2 comprise, each independently, a bond, a vinyl group, a —CR1═N—NR2— group, or a —CR3═N—N═CR4— group;
• and
• R, R1, R2, R3, and R4 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an acyl group, a heterocyclic group, or an aromatic group.