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A water-stable porous anionic metal-organic framework (MOF),[(CH3)2NH2][In(TCPP)4/3]n· (2DMF)n(3H2O)n (1,TCPP =1,1,2,2-tetra(4-carboxylbiphenyl)ethylene),was synthesized.Here,compound 1 showed extremely high sensitivity and selectivity to current general-purpose pesticide 2,6-dichloro-4-nitroaniline (DCN) in aqueous solution.The fluorescence intensity of compound 1 could be decreased as much as 80％ by 6 μL DCN,and it was almost completely quenched only with 20 μL DCN.The results indicate that compound 1 can act as a fluorescent probe for DCN.