Experimental and Theoretical Studies of the Pyrazoline Derivative 5-(4-methylphenyl)-3-(5-methylfuran-2-yl)-1-phenyl-4,5-dihydro-1H-Pyrazole and its Application for Selective Detection of Cd2+ ion as Fluorescent Sensor
作者:Promila Sharma、Shikha Bhogal、Asnake Lealam、Sandeep Kumar、Mohamad Yusuf、Ashok Kumar Malik
DOI:10.1007/s10895-022-02906-5
日期:2022.5
A simple fluorescent chemosensor 5-(4-methylphenyl)-3-(5-methylfuran-2-yl)-1-phenyl-4, 5-dihydro-1H-pyrazole (PY) has been synthesized for the detection of Cd2+ ion.The fluorescent probe PY shows high selectivity for Cd2+in the presence of othermetal ions (Co2+, Cu2+, Hg2+, Mn2+, Zn2+, Fe3+, Pb2+, Ni2+, and Al3+). The fluorescence intensity of the PY has been strongly quenched with increasing concentration of Cd2+ (0–0.9 μM)via photoinduced electron transfer mechanism. The binding constant of Cd2+ to PY for the 1:1 complex isfound to be 5.3 × 105 M−1with a detection limit of 0.09 μM. The chemosensor was successfully applied for determination of Cd2+ in different water samples (tap, river, and bottled water) showing good recovery values in the range of 94.8–101.7% with RSD less than 3%. Density functional theory (DFT) calculations were also performed to investigate electronic and spectral characteristics which are quite agreeable with the experimental value. The results show that the synthesized fluorescent chemosensor shows good selectivity towards Cd2+ and can be readily applied for the detection of Cd2+ in real samples including water samples.
一种简单的荧光化学传感器5-(4-甲基苯基)-3-(5-甲基呋喃-2-基)-1-苯基-4,5-二氢-1H-吡唑(PY)已经合成,用于检测Cd2+离子。在存在其他金属离子(Co2+、Cu2+、Hg2+、Mn2+、Zn2+、Fe3+、Pb2+、Ni2+和Al3+)的情况下,荧光探针PY对Cd2+表现出高度选择性。通过光诱导电子转移机制,Cd2+浓度(0-0.9 μM)增加,PY的荧光强度被强烈淬灭。Cd2+与PY的1:1复合物的结合常数为5.3×105 M-1,检测限为0.09 μM。该化学传感器成功应用于测定不同水样(自来水、河水、瓶装水)中的Cd2+,回收率在94.8-101.7%之间,RSD小于3%。还进行了密度泛函理论(DFT)计算,以研究电子和光谱特性,结果与实验值非常吻合。结果表明,合成的荧光化学传感器对Cd2+表现出良好的选择性,可以很容易地用于检测包括水样在内的实际样品中的Cd2+。