Keli Zhong,Jie Zhao,Xue Zhou,Shuhua Hou,Yanjiang Bian,Jianrong Li,Lijun Tang
A new (8-hydroxyquinolin-2-yl)methylene picolinohydrazide derivative ( L ) has been successfully synthesized and characterized. The probe L displays high selectivity to Co 2+ in CH 3 CN/HEPES (1:1, Ｖ / Ｖ , 10 mmol·L −1 , pH=7.4) with a fluorescence "ON-OFF" response. The Co 2+ ion recognition event possesses some distinct features including rapid response, high selectivity and sensitivity, good anti-interference ability and being applicable within a wide pH range. Based on job's plot and ESI-MS studies, the 1:1 binding mode was proposed. The binding constant of L and Co 2+ is 1.63×10 8 L·mol −1 and the detection limit is 1.15 µmol·L −1 . Natural water samples experiments revealed that probe L can be potentially applied to the detection of Co 2+ in real environment.
Fluorescent sensor has demonstrated to be a facile and effective method to detect heavy metal ions owing to its unique characteristics such as simplicity, ease of operation and cost-effectiveness. In this work, a novel fluorescent probe with aggregation-induced emission (AIE) feature that contains an amide ligand base on the tetraphenylethylene (TPE) dye was designed and successfully synthesized. The utilization of the AIE-active fluorescent probe (named as FDPA) for detection of Cu 2+ in aqueous solution has also been examined. We demonstrated that the resultant AIE-active molecule displays amphiphilic property and can self-assemble in aqueous solution with remarkable enhancement of fluorescent intensity owing to its AIE feature. The detection limit of probe for Cu 2+ determination is 6.11 × 10 −9 M and shows excellent selectivity in the presence of competitive ions. This work provides a useful route to overcome the fluorescence quenching of conventional fluorescent probes in aqueous solution and an elegant way to prepare fluorescent probes with better fluorescence properties.
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