1 research outputs found
Solid-State Luminescence Turn-On Sensing Using MOF-Confined Reporter–Spacer–Receptor Architectures Facilitated by Quencher Displacement
The reporter–spacer–receptor (RSR) approach
is prevalent
to develop molecular turn-on sensors. However, the fluorescent RSR
sensors barely operate in solid state, which hinders their fabrication
into devices for practical applications. Herein, we present a novel
strategy to achieve solid-state luminescence turn-on sensing by assembling
RSR architectures within MOF frameworks. Unlike the regular RSR systems,
the framework-confined fluorophore and receptor are well arranged
and separated even in the solid state. This concept is illustrated
by a multicomponent MOF (Fc@NU-1000), which contains organic linkers
with a highly luminescent pyrene core as the reporter, Zr6 nodes with unsaturated sites as the receptor, and the incorporated
Fc molecules as the quencher. The separate incorporation of pyrene
core and Fc in the multicomponent MOF favors an efficient pseudointramolecular
photoinduced electron transfer (PET) process, resulting in significant
luminescence quenching. Interestingly, such PET process can be blocked
via the quencher displacement initiated by the phosphate analyte,
therefore recovering the solid-state luminescence of MOF microcrystals.
We found that Fc@NU-1000 is shown as a sensitive solid-state luminescence
turn-on probe for phosphate with the naked-eye response at a low content.
What’s more, this study is the first example of confining a
quencher displacement-based RSR system in the MOF framework for solid-state
luminescence turn-on sensing, thus also providing new opportunities
for MOF materials to develop luminescence turn-on sensors