荧光
质子化
质子
化学
分子
离子
选择性
光化学
电子转移
干扰(通信)
分子工程
光诱导电子转移
能量转移
费斯特共振能量转移
组合化学
纳米技术
化学物理
材料科学
有机化学
计算机科学
物理
量子力学
频道(广播)
催化作用
计算机网络
作者
Miao Li,Jiangli Fan,Jianjun Du,Jianfang Cao,Xiaojun Peng
标识
DOI:10.1016/j.snb.2017.12.117
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 ΔG 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.
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