Icli, SAstley, ASTimur, CAnac, OSezer, ODabak, K2019-10-272019-10-2719990022-23130022-2313https://doi.org/10.1016/S0022-2313(99)00022-8https://hdl.handle.net/11454/34333Fluorescence emission from 378 nm excitation yielded fluorescence quantum yields Q(f), radiative lifetimes tau(0), and fluorescence rate constants k(f), in the range of 0.0004-0.0069, 17-132 ns and (0.9-18.2) x 10(6) s(-1), respectively, for seven 4-aroyl(acyl) derivatives of 1-phenyl-1,2,3-triazoles in chloroform solutions. The fluorescence lifetimes, tau(f), are estimated to be 0.01-0.45 ns. Some substitution effects are detected in the fluorescence emission parameters. The strong pi-electron donor, 5,10-dihydrocarbazolo[3,4-c]carbazole,is found ito be quenched by triazoles at quenching rates of 7.7 x 10(10)-2.8 x 10(12) M-1 s(-1). The high rates of fluorescence quenching, k(q), are attributed to a ground state complexation between 1,2,3-triazoles and the strong pi-electron donor carbazolocarbazole. 1,2,3-Triazoles have shown intense solvatochromic absorbance shifts in n-hexane, chloroform and methanol. Absorbance shifts reaching 44 nm were observed from polar to protic solvents. (C) 1999 Elsevier Science B.V. All rights reserved.en10.1016/S0022-2313(99)00022-8info:eu-repo/semantics/closedAccess1,2,3-triazolesfluorescence quantum yieldsfluorescence lifetimesfluorescence quenching ratescarbazolocarbazolesolvatochromic shiftsArticle8214148WOS:000080906800006Q2Q3