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论文类型： 期刊论文

发表时间： 2018-04-15

发表刊物： SENSORS AND ACTUATORS B-CHEMICAL

收录刊物： SCIE、EI

卷号： 259

页面范围： 626-632

ISSN号： 0925-4005

关键字： Sensor; Cell; Fluorescence; Electron transfer; Free energy

摘要： Fluorescent chemosensors are widely used in chemical engineering, bio-engineering, medical engineering, and environmental engineering. A lot of the chemosensors are based on photo-induced electron transfer (PET) process. In complicated practical systems, the proton is always the most serious interference factor. Herein a new method is proposed for PET chemosensor design to overcome the proton interference: to tune the Delta G of the electron transfer process by introducing different substituents of the sensor molecules. Chemosensors for Zn2+ detection are demonstrated. When the highest occupied molecular orbital (HOMO) energy levels of the fluorophores (4-substituted 1, 8-naphthalimide) are lower than the HOMO energy level of protonated receptor (dipicolylamine-H+), the fluorescence responding to Zn2+ ions is not influenced by pH, meanwhile, the chemosensors can work in acidic media with pH below the pKa values. This should reveal a new criterion for designing of PET based chemosensors for selectivity improvement. (C) 2017 Elsevier B.V. All rights reserved.