Triaryl carbonium dyes

Fig. 5. Stmctural interrelationships among diaryl and triaryl carbonium dyes. Pyronine = xanthene (61), R = CH3 is Bindschedler s Green.

Triarylbismuth dilahides, 4 31-33 Triarylbismuthines, 4 26-28 Triaryl carbonium dyes, 9 259-261 Triaryl phosphates, 11 493-494 Triarylpyrazolines, 19 113 Triarylstibines, 3 69 Triarylsulfonium salts, photolysis of,... 

Di- and Triaryl Carbonium and Related Dyes. As a class, these dyes are bright and strong, hut are generally deficient in lightfastness. Consequently, they are used in outlets where brightness and cost-effectiveness. rather than permanence, arc paramount, for example, the coloration of paper. Many dyes of this class, especially derivatives of pyronines Ixamhcnes). arc among the most fluorescent dyes known. 

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