Synthesis and Fluorescent Brightening Properties of Symmetrically Substituted 4,4′-Bis(1,3,5-Triazinyl)-Diaminostilbene-2,2′-Disulfonic Acid Derivatives

Disodium-4,4′-bis(1,3,5-triazinylamino)stilbene-2,2′-disulfonates 5a-5d were synthesized by reacting 4,4′-diaminostilbene-2-2′-disulfonic acid 1 with 2,4,6-trichloro-1,3,5-triazine 2 via the intermediacies of 3 and 4a-4d. The intermediate 3 was reacted with different amines at different temperature conditions to afford other intermediates 4a-4d and finally the desired fluorescent brightener’s 5a-5d. The structures of the products were characterized by UV-visible, IR and H1-NMR spectroscopy techniques. Elemental analyses were found to be in good agreement with the calculated values. These compounds were applied on cotton fiber as fluorescent brighteners and their physical properties were performed by wash-, chlorine-, and light-fastness. The whiteness of the fiber was measured by spectrophotometer.

Muhammad Farooq, Zeeshan Akhtar, Syed Muhammad Saad, Syed Ishrat Ali, Khalid Mohammed Khan, Rasheeda Parveen and Ausaf Aleem