Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 21, Pages 18012-18020Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b05614
Keywords
metal-organic frameworks; dye encapsulation; single-crystal to single-crystal transformation (SC-SC); excimer emission; dual-emitting sensor
Funding
- National Natural Science Foundation of China [21425102, 21573236, 21601080]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
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In this study, a water stable metal 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-SC) transformation, 8-hydroxypyrene-1,3,6-trisulfonate (SG7, solvent green 7, ion form as SG7(3-)) is introduced into the pores of FIR-53 to obtain SG7@FIR-53. Because of the spatial confinement and partition effect, SG7@FIR-53 shows the bright exciter emission of SG7 ions. Interestingly, the composite SG7@FIR-53 exhibits a sensitive fluorescence quenching response against Cr2O72- and MnO4- in aqueous solution. Especially, the detection limit toward MnO4- is as low as 0.12 ppb, which is the smallest value to date. Moreover, the prepared SG7@FIR-53 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.
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