| abstract |
Charge transport compounds are described that have a multiple number of hydrazone-bridged heterocyclic groups (especially julolidine, carbazole and/or triarylmethane groups) connected by a central bridging group. An example of charge transport compounds are those having the following generic formula: n (R—Q) n -Y Formula I n wherein R is selected from the group consisting of julolidine ring groups, carbazole ring groups, and triarylmethane ring groups; n Q comprises an aromatic hydrazone linking group, such as n n n Y comprises a bridging group between R—Q— groups, such as a bond, carbon atom, nitrogen atom, oxygen atom, sulfur atom, a methylene group; Z is an aryl group, preferably a phenyl group or naphthyl group; X is a linking group, preferably amethylene group, and for example having the formula —(CH 2 ) m — (branched or linear), where m is an integer between 0 and 20, inclusive, and one or more of the methylene groups is optionally replaced by an oxygen atom, a carbonyl group, urethane, urea, an ester group, a —NR 6 group, a CHR 7 group, or a CR 8 R 9 group where R 6 , R 7 , R 8 , and R 9 are, independently, H, an alkyl group, or aryl group; and n is an integer between 2 and 6, inclusive. An organic photoreceptor includes that compound and (b) a charge generating compound; and (c) an electrically conductive substrate. |