Fluorescence quenching of 8-methyl quinolinium: An efficient halide indicator mechanism

Effect of halide ions on the fluorescence properties of 3‐aminoquinoline in aqueous medium

“…[ 28,30 ] It should be mentioned that the PET mechanism has been proposed for FL quenching in comparable systems. [ 9,21,35 ] For the present system, the nature of FL quenching was purely dynamic for the specified range of halide ions. The S–V constant was higher than previously reported values of most of the quinoline derivatives and some of the other compounds listed in Table 2, [ 6,9,10,21,23 ] and covered the longest concentration range (4 μM to 10 mM).…”

“…[ 9,21,35 ] For the present system, the nature of FL quenching was purely dynamic for the specified range of halide ions. The S–V constant was higher than previously reported values of most of the quinoline derivatives and some of the other compounds listed in Table 2, [ 6,9,10,21,23 ] and covered the longest concentration range (4 μM to 10 mM). Furthermore, the decays were monoexponential, therefore making the quenching analyses simple and the system more useful.…”

“…A broad array of compounds, including halides ions, [ 6–13 ] metal ions, [ 14–17 ] molecular oxygen, [ 18,19 ] and chlorinated hydrocarbons [ 1,13 ] acts as quenchers. The quinoline derivatives are regarded as promising candidates for FL quenching by halides.…”

“…The quinoline derivatives are regarded as promising candidates for FL quenching by halides. [4,[8][9][10]13,[20][21][22][23][24] These derivatives are advantageous in molecular recognition and FL sensing. They are used as pH sensors, intercalators, and fluorescent indicators to measure halide concentrations.…”

“…Static and dynamic processes can simultaneously quench the fluorescence and show a positive deviation from linearity in the S-V plot. [1,2,4,5] A broad array of compounds, including halides ions, [6][7][8][9][10][11][12][13] metal ions, [14][15][16][17] molecular oxygen, [18,19] and chlorinated hydrocarbons [1,13] acts as quenchers. The quinoline derivatives are regarded as promising candidates for FL quenching by halides.…”