A novel fluorescence probe for sensing organic amine vapors from a Eu3+ beta-diketonate functionalized bio-MOF-1 hybrid system

A classic anionic metal-organic framework (bio-MOF-1, Zn-8(ad)(4)(BPDC)(6)O center dot 2Me(2)NH(2) (BPDC = biphenyl-4,4'- dicarboxylate, Ad = adeninate)) encapsulating Eu3+-beta-diketonate complexes via cation exchange can be used for sensing volatile organic molecules, especially volatile amines, which is of great significance for environmental and industrial monitoring. Subsequently, the Eu3+-beta-diketonate functionalized hybrid system can sensitively detect volatile organic amines by exhibiting a distinct color variation. This means the luminescence intensity of the D-5(0) -> F-7(2) transition can be significantly enhanced in a basic environment such as diethylamine and dramatically decreased in an acidic environment like formic acid. The change in environment is accompanied by a colour change from bright red in diethylamine to light purple in formic acid.