Synthesis And Applications Of Invisible Fluorescent Pigments

Our research focuses on a kind of invisible fluorescent pigments with the maximum absorption wavelengths are shorter than 365nm and the maximum fluorescent wavelength are around 500nm. The main works are belows,Four terbium complexes were synthesized. Three of them were made into the printing ink used as fluorescent pigments, whose printings on the paper displayed strong fluorescence intensity with maximum wavelength around 510nm irradiated by 254 nm light. They were resisitant to alkali and normal solvents, especially in a case of terbium complexes employed 1-phenyl-3-methyl-4-acetyl-pyrazolone-5 and 1-phenyl-3-methyl-4-propyl-pyrazolone-5 as ligands.A series of quinazolinone compounds were synthesized. Five of them were made into the printing ink used as fluorescent pigments, whose printings on the paper illustrated high fluorescence intensity with maximum wavelength around 500nm irradiated by 365 nm light. They were resisitant to heat, acid and normal solvents, especially in a case of 5-chloro-2-[5'-chloro-2'-4'-chlorophenyl sulfonyl amino] phenyl-4(3H)-quinazolinone.1,4-bis-styryl-benzene, 1,4-bis(2'-cyano-styryl)benzene and their mixture were synthesized and made into the printing ink used as fluorescent pigments. The printings on the paper indicated high fluorescence intensity with maximum wavelength were at 472nm, 485nm,480nm, respectively, irradiated by 365 nm light. They were highly resisitant to heat, alkali, acid and normal solvents.