Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani Campus, 333031, Pilani, Rajasthan, India.
Department of Chemistry, Birla Institute of Technology and Science Pilani, Hyderabad Campus, 500078, Secunderabad, Telangana, India.
Photochem Photobiol Sci. 2020 Jul 1;19(7):931-942. doi: 10.1039/c9pp00477g. Epub 2020 May 6.
An imidazolium-based quinoline Schiff base ImSB was developed and fully characterized by FT-IR, H and C NMR spectroscopy, mass spectrometry, and X-ray crystallography. The fluorescence behaviour of ImSB in solution and in the solid state, keto-enol stability at different concentrations and pH in aqueous medium were investigated. The UV-visible and fluorescence studies were performed to determine the response of ImSB towards different ions in aqueous medium. ImSB showed a turn-on fluorescence behaviour with high selectivity towards Al over various cations and anions due to chelation-enhanced fluorescence (CHEF), inhibition of photoinduced electron transfer (PET) and restriction of C[double bond, length as m-dash]N isomerization. The low detection limit for Al was 54 nM and Job's plot confirmed 1 : 1 stoichiometry between ImSB and Al with a high binding constant value of 4.16 × 10 M. Monitoring of Al was also demonstrated in real water samples (mineral, river and tap water). The structural and electronic parameters of ImSB and ImSB-Al were also studied theoretically.
一种基于咪唑鎓的喹啉希夫碱 ImSB 通过傅里叶变换红外光谱、氢谱和碳谱、质谱和 X 射线晶体学得到了充分的表征。研究了 ImSB 在溶液和固态中的荧光行为、在不同浓度和 pH 值下在水介质中的酮-烯醇稳定性。进行了紫外-可见和荧光研究，以确定 ImSB 对水介质中不同离子的响应。ImSB 表现出开启荧光行为，对 Al 具有高选择性，而对各种阳离子和阴离子则没有选择性，这是由于螯合增强荧光（CHEF）、抑制光诱导电子转移（PET）和限制 C[双键，长度为 m-dash]N 异构化。Al 的检测限低至 54 nM，Job 图证实 ImSB 和 Al 之间的化学计量比为 1:1，结合常数值高达 4.16×10 M。还在实际水样（矿泉水、河水和自来水）中监测了 Al。还从理论上研究了 ImSB 和 ImSB-Al 的结构和电子参数。
