Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, People's Republic of China.
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, People's Republic of China.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Apr 15;213:97-103. doi: 10.1016/j.saa.2019.01.044. Epub 2019 Jan 17.
A new oligothiophene functionalized Schiff base sensor 3TDC has been successfully designed and synthesized. Sensor 3TDC exhibited "naked-eye" colorimetric and selective "on-off" fluorescence response toward Cu with high selectivity and sensitivity within a wide pH range. The binding ratio of the sensor 3TDC and Cu was determined to be 1:1 through fluorescence titration, Job's plot, H NMR titration, FTIR and DFT studies. The detection limit is calculated to be as low as 2.81 × 10 M, which is much lower than the allowable level of Cu in drinking water set by U.S. Environmental Protection Agency (20 μM) and the World Health Organization (30 μM). The binding constant (K) of Cu to sensor 3TDC was found to be 2.52 × 10 M. Sensor 3TDC for Cu detection exhibited fast fluorescence response within 30 s and high anti-interference performance. Moreover, sensor 3TDC could be used as an effective fluorescent sensor for detecting Cu ions in various real water and food samples with good accuracy and high precision.
一种新的寡噻吩功能化席夫碱传感器 3TDC 已被成功设计和合成。传感器 3TDC 对 Cu 表现出“肉眼可见”的比色和选择性“开-关”荧光响应，具有高选择性和灵敏度，且在较宽的 pH 范围内。通过荧光滴定、Job 图、1H NMR 滴定、FTIR 和 DFT 研究，确定传感器 3TDC 与 Cu 的结合比为 1:1。检测限计算低至 2.81×10-7 M，远低于美国环境保护署（20 μM）和世界卫生组织（30 μM）规定的饮用水中 Cu 的允许水平。发现 Cu 与传感器 3TDC 的结合常数（K）为 2.52×104 M。用于 Cu 检测的传感器 3TDC 具有 30 s 内快速荧光响应和高抗干扰性能。此外，传感器 3TDC 可作为一种有效的荧光传感器，用于检测各种实际水样和食品样品中的 Cu 离子，具有良好的准确性和高精度。
