A novel pyridylvinyl naphthalimide-rhodamine dye: Synthesis, naked-eye visible and ratiometric chemodosimeter for Hg2+/Fe3+

作者：Liu, Jianfeng; Qian, Ying^*

来源：Journal of Luminescence, 2017, 187: 33-39.

DOI：10.1016/j.jlumin.2017.02.058

• Naphthalimide-rhodamine
• Ratiometric chemodosimeter
• Dual-channel signal
• Fe3+ and Hg2+ probe
• Reversible protonation

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 H-1 NMR, C-13 NMR and HRMS techniques. This probe shows high selectivity and sensitivity towards Fe3+ and Hg2+. At a low concentration of Fe3+/Hg2+, a new emission peak appeared at 581 nm and enhanced significantly along with naked-eye sensitive color changes, which spirolactamring moiety of rhodamine was converted to the open-ring form in the presence of Fe3+/Hg2+. Further addition of Fe3+/Hg2+, 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 x 10(-8) M and 9.08 x 10(-8) M, and the dissociation constant (Kd) were calculated to be 4.95 x 10(-7) M-3/(2) and 6.68 x 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.

• 出版日期2017-7
• 单位东南大学