Pyridopyrimidine mercaptohydrazide Al < 3 + > and Zr < 4 + > fluorescent probe

The invention relates to a pyridopyrimidine mercaptohydrazide Al < 3 + > and Zr < 4 + > fluorescent probe, which is prepared by the following steps: reacting 3-(dimethylamino)-1-(pyridine-4-yl)-2-propylene-1-ketone with thiourea to obtain an intermediate 1, reacting the intermediate 1 with ethyl bromoacetate to obtain an intermediate 2, and reacting the intermediate 2 with ethyl bromoacetate to obtain the pyridopyrimidine mercaptohydrazide Al < 3 + > and Zr < 4 + > fluorescent probe. The intermediate 2 and hydrazine hydrate are subjected to an amidation reaction to obtain an intermediate 3, the intermediate 3 and 2-hydroxy-1-naphthaldehyde are subjected to amine-aldehyde condensation, and the pyridopyrimidine mercaptohydrazide Al < 3 + > and Zr < 4 + > fluorescent probe is prepared. The fluorescent probe is a high-selectivity chemical sensor which has the advantages of cheap and easily available raw materials, high yield, wide pH application range, strong anti-interference capability and high selectivity, can