%0 Journal Article
%T Dual-Emission [email protected] Sensor via SC每SC Transformation: Enhancing the Formation of Excimer Emission and the Range and Sensitivity of Detection
%J -
%D 2018
%R https://doi.org/10.1021/acsami.8b05614
%X In this study, a water stable metal每organic framework FIR-53 is applied as a single-crystal container for anion exchange. The exceptional chemical stability and low crystallographic symmetry of FIR-53 makes it possible to determine anionic guests. Through ion exchange and single-crystal to single-crystal (SC每SC) transformation, 8-hydroxypyrene-1,3,6-trisulfonate (SG7, solvent green 7, ion form as SG73每) is introduced into the pores of FIR-53 to obtain [email protected]. Because of the spatial confinement and partition effect, [email protected] shows the bright exciter emission of SG7 ions. Interestingly, the composite [email protected] exhibits a sensitive fluorescence quenching response against Cr2O72每 and MnO4每 in aqueous solution. Especially, the detection limit toward MnO4每 is as low as 0.12 ppb, which is the smallest value to date. Moreover, the prepared [email protected] film also displays a broad response to nitro explosives in vapor/aqueous phase. Compared with the results of FIR-53, the range and sensitivity were greatly improved
%U https://pubs.acs.org/doi/10.1021/acsami.8b05614