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Dipodal quinoline-tethered fluorescent probe synthesis and investigation of spectroscopic properties
(ELSEVIER SCIENCE BV, 2017) Obali, Aslihan Yilmaz; Yilmaz, Menzeher Serkan; Ucan, Halil Ismet
Novel quinoline-tethered fluorescent probe was designed and synthesized as multidentate ligand. Their sensing actions were confirmed by UV-Vis absorbance and emission spectroscopic studies in presence of perchlorate salts of Co2+, Li+, Fe2+, K+, Pb2+, Cu2+, Zn2+, Ni2+, Hg2+, Ag+ cations in acetonitrile (1 x 10(-5) M for absorption studies, 1 x 10(-7) M for fluorescence studies). It was found that the dipodal compounds can selectively bind to Cu2+ and Ag+ metal ions with a significant quenching in their emissions. The capture of Cu2+ and Ag+ by the probe resulted in deprotonation of the secondary amine conjugated to the quinoline-tethered probe, so that the electron-donation ability of the 'N' atom would be greatly enhanced and the probe (2) showed blue-shift in emission and exhibited an on-off fluorescent response. The binding study was explored by using fluorescence spectroscopy with Job plot method. (C) 2017 Elsevier B.V. All rights reserved.