Journal
JOURNAL OF APPLIED SPECTROSCOPY
Volume 89, Issue 3, Pages 487-494Publisher
SPRINGER
DOI: 10.1007/s10812-022-01384-8
Keywords
1; 8-naphthalimide; fluorescent sensor; Hg2+ ion; Schiff base
Categories
Funding
- Foundation of a Hundred Youth Talents Training Program of Lanzhou Jiaotong University [152022]
- National Natural Science Foundation of China [21367017]
- Natural Science Foundation of Gansu Province [17JR5RA090]
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A new fluorescent turn-on sensor for Hg2+ has been designed, showing high selectivity and good quantitative detection performance. The complex between HL and Hg2+ is formed by a 2:1 complex ratio.
A new fluorescent turn-on sensor for Hg2+, N-allyl-4-(ethylenediamine-5-methylsalicylidene)-1,8-naphthalimide (HL) has been designed by combining a 1,8-naphthalimide moiety as a fluorophore and a Schiff base as a recognition group. As expected, HL displays high selectivity for Hg2+ over other ions (Na+, K+, Ca2+, Mg2+, Al3+, Pb2+, Fe3+, Ni2+, Zn2+, Hg2+, Ag+, Co2+, Cr3+, Mn2+, and Cd2+) with obvious fluorescence enhancement in solution (DMF/Tris-HCl buffer, 1:1, v/v, pH 7.2). Moreover, the fluorescence intensity of HL has shown good linearity with a correlation coefficient (R-2) of 0.99, confirming that HL could be applied to quantitatively detect mercury ions in the range of 0.5-4.0 mu m, whereby the detection limit reaches 0 .26 mu m. Meanwhile, the association constant (K-a) between Hg2+ and HL achieves 7.35 x 10(11) M-1. Based on the fluorescence titration and Job's plot analysis, the formation of a complex between HL and Hg2+ is by 2:1 complex ratio.
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