Patent ID: 7452641

Claim:
A charge transport compound having the following formula: (R-Q) n -Y where R is triarylamine group, diaryl alkylamine group or dialkyl arylamine group; Q comprises an aliphatic or aromatic hydrazone linking group wherein the hydrazone linking group has the formula: where Z is an alkyl group or an aryl group; and X is —(CH 2 ) m — where m is an integer between 0 and 20; n is 2; and Y has the formula: where A 1 , A 2 , A 3 , A 4 , A 5 , A 6 , A 7 , and A 8 comprise, each independently, H, an aryl group, a heterocyclic group, a hydroxyl group, a thiol group, a cyano group, a nitro group, a carboxyl group, an amino group, a halogen, an acyl group, an alkoxy group, an alkylsulfanyl group, an alkenyl group, an alkynyl group, a part of a ring group, such as cycloalkyl groups, heterocyclic groups, and a benzo group, or an alkyl group where one or more of the hydrogens of the alkyl group is optionally replaced by an aromatic group, a hydroxyl group, a thiol group, a carboxyl group, an amino group, or a halogen.