首页|A highly selective bis(salamo)-based fluorescent sensor for two-pronged recognitions to Cu2+ and Arg
A highly selective bis(salamo)-based fluorescent sensor for two-pronged recognitions to Cu2+ and Arg
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NSTL
Elsevier
A novel salamo-based fluorescent sensor H3L was synthesized and characterized by IR, H-1 NMR and ESI-MS. The results showed that the fluorescence spectra and UV-Vis absorption spectra of H3L changed with the addition of Cu2+ and Arg respectively. The introduction of Cu2+ ions caused significant fluorescence quenching. The combination of Cu2+ ions and the sensor was confirmed by X-ray crystallography of the copper(II) complex [{Cu-2(L)}(2)](ClO4)(2)center dot H2O, which can lead to fluorescence quenching through coordination coupling. The response of the amino acid Arg to H3L was turned on by fluorescence and their combination was characterized by IR and ESI-MS. The sensitivity of the fluorescence response to Cu2+ ion and Arg was determined by their LODs 6.5084 x 10(-8) M and 1.7271 x 10(-7) M, respectively. At the same time, it was determined by titration experiments that H3L and Cu2+ ions are combined at a ratio of 1:2, and 1:1 with Arg. Calculating their binding constants are 6.91 x 10(9) M-1 and 3.17 x 10(9) M-1, respectively.
NSTL
Elsevier
