| 摘要 |
<p>Electrophotosensitive pigment is a fluorescein deriv. of formula:- (wherein X is H, halogen or -NO2; Me is Pb, Al or Cr; Y is H- or lower alkyl; and n is 1-4). Preferred pigments are the lead derivs. of 2,7-dinitro-4,5-dibromofluorescein and 2,4,5,7-tetrabromofluorescein.</p> |
