PYRILIUM SALT AS SENSITIZING AGENT FOR ELECTROPHOTOGRAPHIC MATERIAL WITH PANCHROMATIC SENSITIVITY IN VISIBLE SPECTRUM REGION Russian patent published in 1999 - IPC

FIELD: light-sensitive materials. SUBSTANCE: invention, in particular, relates to 2,4-di(phenyl or p-bromophenyl)-6-[beta-ethenyl-(N- propylcarbazol-3-yl)] pyrilium tetrafluoroborate (compounds Ia and Ib). Synthesis of these compounds is effected by boiling of mixture of 2- methyl-4,6-di(phenyl or p-bromophenyl)pyrilium tetrafluoroborate with 3-formyl-9-propylcarbazole in acetic anhydride medium. Yields of products (respectively) are 81 and 84%; melting points 217-220 and 282-284 C; maximum wavelengths (λ_max) in methylene dichloride: (a) 370 and 620 and (b) 392 and 645 nm; extinction coefficients (ε_max) (a) C₃₄H₂₈OBF₄N and C₃₄H₂₆OBF₄Br₂N and (b) lux^-1s^-1 and ; gross formulas and . Tests of compounds Ia and Ib in light-sensitive layers of electrophotographic material show photoelectric sensitivity to light of incandescent lamp to be 2.2 lux^-1s^-1; the same to monochromatic light in 400-700 nm region: 3 sq.m/J and 1.3 sq.m/J; degree of panchromaticity () 0.8; long-wave layer sensitivity limit at which sensitivity is at least 0.1 sq.m/J 760 nm (at concentration of compound Ia 0.5%, poly-N- epoxypropylcarbazole 98%, and trinitrofluorenone 1.5%). EFFECT: improved photoelectric sensitivity and extended spectral region of sensitivity. 1 tbl