Salicylaldehyde,　a　widely　utilized　compound　in　various　industries,　poses　significant　environmental　and　health　risks.　This　study　presents　the　development　of　a　highly　selective　and　sensitive　fluorescent　probe　based　on　amine-functionalized　metal-organic　frameworks　(Eu-MOF)　for　detecting　salicylaldehyde.　The　Eu-MOF,　synthesized　via　a　solvothermal　method,　exhibits　excellent　stability,　a　high　surface　area,　and　selective　fluorescence　quenching　upon　interaction　with　salicylaldehyde.　The　limit　of　detection　was　determined　to　be　7.1　ppm,　with　minimal　interference　from　other　aromatic　aldehydes.　Mechanistic　investigations　revealed　that　fluorescence　quenching　occurs　due　to　Schiff　base　formation　between　salicylaldehyde　and　amine　groups　of　Eu-MOF.　These　findings　highlight　the　potential　of　Eu-MOF　as　an　effective　tool　for　selective　and　efficient　environmental　monitoring.　©　2025　American　Chemical　Society.