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The reaction mixture was allowed to stir at room temperature until it was completed (monitored by TLC). After completion, the reaction mixture was poured on crushed ice to eliminate copper sulfate and sodium ascorbate, set aside for some time (until ice converted into the water completely), filtered and dried to get the crude product. Obtained crude product was purified by using column chromatography using hexane: ethyl acetate (6: 4) to get triazole tethered coumarin benzotriazole hybrids. All the hybrids were synthesized in similar manner. Characterization data of most potent compound 4-(3-(4-((1H-benzo[d][1,2,3]triazol-1-yl)methyl)-1H-1,2,3-triazol-1-yl)propoxy)-2H-chr omen-2-one (13b). Yield 74%, mp 166-168\u00b0 C, Yellowish powder. 1H NMR (500 MHz, DMSO-d6) \u03b4 8.32 (s, 1H), 8.04-8.03 (m, 1H), 7.90-7.88 (d, J = 10 Hz, 1H), 7.74-7.72 (d, J = 10 Hz, 1H), 7.66-7.63 (m, 1H), 7.55-7.52 (m, 1H), 7.41-7.38 (m, 2H), 7.34-7.31 (m, 1H), 6.04 (s, 2H), 5.85 (s, 1H), 4.61-458 (m, 2H), 4.22-4.19 (m, 2H), 4.39-4.37 (m, 2H). 13C NMR (125 MHz, DMSO-d6) \u03b4 165.19, 162.78, 162.04, 153.18, 146.02, 142.13, 133.21, 127.84, 124.87, 124.54, 123.45, 119.60, 116.84, 115.54, 111.32, 91.07, 67.12, 47.21, 43.41, 36.24, 29.13. Anal. Calcd for C21H18N6O3: C, 62.68; H, 4.51; N, 20.88. 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