A novel pyrazinyl dihydrazine was prepared by acylation from 6-chloro-3-hydrazine pyrazine.The structure of the new compound was analyzed by infrared spectroscopy,nuclear magnetic resonance and mass spectrometry.The thermal and optical properties of the novel pyrazinyl dihydrazine were studied by thermogravimetry and fluorescence spectrometry.The results indicate that it has excellent thermal stability and fluorescence properties,and can effectively detect low concentra-tions of Fe3+and Cr2O72-,with detection limits of 2.10×10-8mol/Land4.64×10-9mol/L.Therefore,the synthesized compounds can be used as fluorescent probes to detect Fe3+and Cr2O72-.
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