肉眼
化学
荧光
罗丹明
检出限
部分
可见光谱
光化学
质子核磁共振
离解(化学)
选择性
罗丹明B
分析化学(期刊)
光催化
光电子学
有机化学
材料科学
催化作用
光学
色谱法
物理
作者
Jianfeng Liu,Ying Qian
标识
DOI:10.1016/j.jlumin.2017.02.058
摘要
Abstract In this work, a novel pyridylvinyl rhodamine-naphthalimide ratiometric fluorescent probe, In this work, a novel pyridylvinyl rhodamine-naphthalimide ratiometric fluorescent probe, RNVP , was synthesized and characterized by 1 H NMR, 13 C NMR and HRMS techniques. This probe shows high selectivity and sensitivity towards Fe 3+ and Hg 2+ . At a low concentration of Fe 3+ /Hg 2+ , a new emission peak appeared at 581 nm and enhanced significantly along with naked-eye sensitive color changes, which spirolactam-ring moiety of rhodamine was converted to the open-ring form in the presence of Fe 3+ /Hg 2+ . Further addition of Fe 3+ /Hg 2+ , the fluorescence intensity at 438 nm was enhanced rapidly, which attributed to the suppression of the PET process. The proposed sensing system of probe RNVP represented dual-channel and segment detection behavior, with the fluorescence “turn-On or Off” response and a very low detection limit of 2.72×10 −8 M and 9.08×10 −8 M, and the dissociation constant (Kd) were calculated to be 4.95×10 −7 M 3/2 and 6.68×10 −8 M 3/2 , respectively. RNVP also quick responded linearly to the acidic solution and monitor the pH change in the range of 2.92–4.5, as well as excellent reversibility.
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