| Metal ions play a very important role in different life processes and have an impact on human health and the environment.This paper mainly studies the detection of two common metal ions(Al3+,Zn2+).It is well known that aluminum is the third most abundant element in the earth's crust.And aluminum element and its compounds are widely used in our daily life.Excessive aluminum ion not only adversely affects plant growth,but also affects the human central nervous system and health.Zinc ion is the second rich transition metal ion in human body and plays a key role in important biochemical processes such as neurotransmission,gene expression and enzyme regulation.Traditional detection methods?atomic absorption spectroscopy,atomic emission spectroscopy,high performance liquid chromatography,etc.?require expensive equipment costs,professional operating technicians,and cumbersome sample preparation operations.Fluorescent probe methods can not only make up for these shortcomings,as well as possess the ability to respond quickly and accurately to the detection of the analytes.Therefore,fluorescent probes have been widely concerned by scholars.In this paper,a series of chromone-based fluorescent probes were designed to detect aluminum ion and zinc ion.We designed and synthesized 7-methoxychromone-3-aldehyde?3'4'5'-trimethoxybenzoyl?hydrazone as a fluorescent probe L1 for detecting Al3+.Probe L1 exhibits significant"fluorescence enhancement"in the presence of Al3+in ethanol solvent.It also has excellent selectivity and sensitivity to Al3+over other common metal ions.The photoinduced electron transfer?PET?process and the C=N isomerization process can be used to explain this fluorescence enhancement effect.The detection limit of the probe L1 towards Al3+is 2.14×10-77 M,and the Al3+is roughly detected on the filter paper.We designed and synthesized 7-methoxychromone-3-aldehyde?rhodamine B carbonyl?hydrazone as a fluorescent probe L2 for detecting Zn2+.Probe L2 exhibits pronounced"fluorescence enhancement"to Zn2+in 70%ethanol solvent.Probe L2 produces significant fluorescence enhancement at the emission wavelength of 490 nm in the presence of Zn2+and has well selectivity and sensitivity to Zn2+over other common metal ions.The photoinduced electron transfer?PET?process can be used to explain this fluorescence enhancement effect.The detection limit of L2 to Zn2+is 2.69×10-77 M,and the Zn2+is roughly detected on the filter paper.We designed and synthesized 6-ethoxychromone-3-carbaldehyde-?3'-hydroxy-2'-naphthalene acyl?hydrazone as a fluorescent probe L3 for detecting Al3+.Probe L3 exhibited an obvious"fluorescence enhancement"to Al3+in 75%ethanol solution.Probe L3 produces significant fluorescence enhancement at an emission wavelength of 508 nm in the presence of Al3+and has good selectivity and sensitivity to Al3+over other common metal ions.The photoinduced electron transfer?PET?process and the C=N isomerization process can be used to explain this fluorescence enhancement effect.The detection limit of probe L3 for Al3+can reach 1.82×10-77 M.And a rough detection of Al3+was successfully performed on the filter paper. |
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