Citation: WU Hong-Mei, GUO Yu, CAO Jian-Fang, CHEN Qiang-Qiang. A Highly Sensitive Fluorescent Probe for Detection of Magnesium Ion Based on Novel Schiff's Base[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(3): 379-385. doi: 10.11895/j.issn.0253-3820.171256 shu

A Highly Sensitive Fluorescent Probe for Detection of Magnesium Ion Based on Novel Schiff's Base

School of Chemical and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, China

Received Date: 15 September 2017
Revised Date: 11 January 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21601075, 21606118) and the Natural Science Foundation of Liaoning Province, China (No.2015020249).

A highly sensitive fluorescent probe TZ based on a novel Schiff's base was prepared for detection of Mg²⁺. It was constituted by introducing dansyl chloride and 2-hydroxy-1-naphthaldehyde through amino and hydrazide groups on p-aminobenzoyl hydrazide. The recognition mechanism of the fluorescent probe TZ for Mg²⁺ was studied by electrospray ionization mass spectrometry (ESI-MS), UV-vis and fluorescence spectra. UV-vis spectra showed that the probe TZ had a characteristic absorption peak of naphthalene aldehyde at 386.5 nm, and a new absorption peak at 411 nm was observed after coordination between TZ with Mg²⁺. A sharp isobestic point was obtained at 400 nm. Fluorescence spectra showed that the emission wavelength was red-shifted to 400 nm upon the addition of Mg²⁺ into probe TZ. The fluorescence intensity was enhanced by 10 times at the emission wavelength of 468 nm and the quantum yield of 0.57 was obtained. Moreover, chemical bond energy transfer was found when 2-hydroxy-1-naphthaldehyde was coordinated with Mg²⁺. When the other metal ions (Li⁺, Na⁺, K⁺, Zn²⁺, Ca²⁺, Mn²⁺, Cd²⁺, Pb²⁺, Ag⁺, etc.) were added into TZ, no significant change of fluorescence intensity was observed. It indicated that TZ had high selectivity to Mg²⁺. Furthermore, the recognition of TZ to Mg²⁺ was not interfered by other competing metal ions. ESI-MS titration and Job's plot analysis confirmed that 1:1 complexation stoichiometry between TZ and Mg²⁺ was obtained. The lowest detection limit was up to 0.13 μmol/L.
- Magnesium ion,
- Fluorescent probe,
- Detection,
- Schiff's base,
- Coordination
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