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E-mail: yhmkang@hanyang.ac.krReceived February 27, 2013, Accepted April 24, 2013In this work, the key intermediate, 4-amino-4'-(2-amino-4-anilino-1,3,5-triazine-6-yl)-aminostilbene-2,2'-di-sulfonic acid, was prepared from 4-(2-amino-4-anilino-1,3,5-triazine-6-yl)amino-4'-nitrostilbene-2,2'-disulfonateby using Tin(II) chloride as the reducing agent. Using this intermediate, nineteen new asymmetrically substitutedbistriazinylstilbene fluorescent brightening agents were synthesized. Chemical structures of the obtainedcompounds 5a-s were analyzed by proton NMR spectrum. The physical properties of the new compounds5a-s were characterized by fastness test and whiteness measurement test and the obtained data were comparedto measurements obtained from CI 86.Key Words : Bistriazinylstilbene fluorescent brightening agents, 2,4,6-trichloro-1,3,5-triazine, Asymmetrical,Whiteness, FastnessIntroductionFluorescent brightening agents (FBAs) are fluorescentorganic compounds with affinity for various organic materialssuch as fiber, paper, and plastic. Typical FBAs are directdyes which can absorb ultraviolet ray (330-380 nm) andemit visible blue lights (400-450 nm).

bulletin of the korean chemical society

The Synthesis and Properties of Asymmetrically Substituted 4,4'-Bis(1,3,5-triazine-6-yl)diaminostilbene-2,2'-disulfonic Acid Derivatives as Fluorescent Brighteners [II]