Abstract: Several bisazo pigments were synthesized by coupling 2, 7-diaminoflurenone with avariety of 2-hydroxy-3-naphthanilides. The results of elementary analysis and iRindicatedthat the synthesis and purification were successful. The UVspectra of the pigments in DMFrevealed that the visible absorption bands of Azo-3 and Azo-4 were red-shifted obviouslywhich can be attributed to the significant conjugate effect. When the pigments in DMFwereirradiated using an infrared lamp, the properties of photochrism were observed. When theirradiation was carried out by using a high pressure mercury lamp, the absorption of thesolutions was decreased. The xerographic performence of Azo-3 in combination with two chargetransport molecules [ 4-(diethylamino) benzaldehyde diphenyl-hydrozone (DEH) and4(dimethylamino) benzaldehyde phenylnaphthylhydrozone (DENH)] was investigated. Wefound Azo-3 has a better photosensitivity by using DENHas charge transport molecule andpoly(methyl methacrylate) (PMMA) as charge blocking layer.

Key words: 2,7-Diaminofluorenone, Blsazo pigment, Photochrism, Photoconductivity