Photophysics Laboratory, Department of Physics, Centre of Advanced Study, DSB Campus, Kumaun University, Nainital, India.
Laser-Spectroscopy Laboratory, Department of Applied Physics, Delhi Technological University, Bawana Road, Delhi, India.
Luminescence. 2023 Jul;38(7):1192-1198. doi: 10.1002/bio.4323. Epub 2022 Jul 23.
Fluorescence (FL) quenching of 3-aminoquinoline (3AQ) by halide ions has been explored in an aqueous acidic medium using the steady-state and time-domain FL measurement techniques. The halide ions showed no significant change in the absorption spectra of 3AQ in an aqueous acidic medium. The FL intensity was strongly quenched by ions and the order of FL quenching by halide ions was . The decrease in FL lifetime along with the reduction in FL intensity of 3AQ suggested the dynamic nature of quenching. The obtained values were 328 for ions and 119 for ions and the values were ~ and , respectively. The observations suggested that the likely governing mechanism for FL quenching may be an electron transfer process and the involvement of the heavy atom effects.
在水相酸性介质中，利用稳态和时域荧光测量技术研究了卤离子对 3-氨基喹啉（3AQ）的荧光猝灭。在水相酸性介质中，卤离子对 3AQ 的吸收光谱没有明显变化。 离子对 3AQ 的荧光强度有强烈猝灭作用，卤离子的荧光猝灭顺序为 。随着 3AQ 的荧光强度降低，荧光寿命也随之降低，表明猝灭具有动态性质。获得的 值分别为 328 对于 离子和 119 对于 离子， 值分别约为 和 ，分别。这些观察结果表明，荧光猝灭的可能控制机制可能是电子转移过程和重原子效应的参与。
