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Fluorescence Turn-On Response Amplified by Space Confinement in Metal–Organic Frameworks
journal contribution
posted on 2019-12-03, 15:24 authored by Xue-Mei Yin, Lu-Lu Gao, Peng Li, Ran Bu, Weng-Jie Sun, En-Qing GaoSensitive fluorescence turn-on response to specific substances
is highly desired for development of chemical sensors and switches.
Here we utilized a “two-in-one” strategy to prepare
ionic metal–organic frameworks (MOFs) functionalized with the
cationic bipyridinium receptors at the frameworks and anionic fluorescent
indicators in the pores. The MOFs are rendered a fluorescence-resting
state because the indicator’s fluorescence is efficiently quenched
by the ground-state charge-transfer (CT) complexation between the
indicator and receptor. Addition of an alkylamine efficiently turns
on the fluorescence because the indicator is displaced by the CT complexation
between alkylamine with receptor. The turn-on response is highly specific
to alkylamines. The MOFs can be used as recyclable sensors for selective
and sensitive detection of alkylamines, with ultralow detection limits
(0.5 nM). The fluorescence in solid state can be reversibly switched
on and off with high contrast. The sensitive and high-contrast response
can be attributed to the space confinement effects of the porous frameworks.
The confined space can significantly enhance indicator–receptor
and analyte–receptor interactions, and thereby both the quenching
efficiency in the off state and the displacement efficiency in the
on state are amplified.
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detectionFluorescence Turn-On Response AmplifiedindicatorCT complexationspace confinement effectsfluorescence turn-on responsechemical sensorsquenching efficiencyhigh-contrast responsedisplacement efficiencyframeworkturn-on responseSpace Confinementalkylaminecationic bipyridinium receptorsfluorescence-resting stateground-state charge-transferMOF
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