Several bisazo pigments were synthesized by coupling 2, 7-diaminoflurenone with avariety of 2-hydroxy-3-naphthanilides. The results of elementary analysis and iR indicatedthat the synthesis and purification were successful. The UV spectra 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 DMF wereirradiated 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 DENH as charge transport molecule andpoly(methyl methacrylate) (PMMA) as charge blocking layer.
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