摘要
Tuning F?rster resonance energy transfer(FRET)in metal-organic frameworks for fluorescence turn on sensing is rarely reported.Herein,we designed and synthesized several FRET-based metal-organic frameworks(MOFs)with different donor/acceptor ratios.Through the oxidation of the acceptor,the FRET process in MOFs can be efficiently modulated so as to turn-on the fluorescence of the framework in a controlled manner.Interestingly,the MOF with an optimized donor/acceptor ratio of 7.0 was used as an efficient fluorescence turn on sensor for Hg(Ⅱ)ions with good sensitivity and selectivity.We believe our present study will not only give a useful method to construct fluorescence turn-on sensors but also trigger the construction of novel FRET-based MOFs for the fluo-rescence turn-on sensing of target analytes in the future.
基金
financial support from the National Natural Science Foundation of China(21975188,21905211,U21A20285)
B.G.is thankful to Wuhan University for start-up funds(600460062).
