Fluorescent
and electron-rich polymer threaded into porous framework
provides a scaffold for sensing acceptor molecules through noncovalent
interactions. Herein, poly(9-vinylcarbazole) (PVK) threaded MIL-101
with confined nanospace was synthesized by vinyl-monomer impregnation,
in situ polymerization, and interpenetration. The pore size of the
resulted hybrid could be controlled by varying the time of polymerization
and interpenetration. The interaction of PVK-threaded MIL-101 with
guest molecules showed a charge-transfer progress with an obvious
red shift in the optical spectra. Depending on the degree of the interaction,
the solution color changed from blue to green or to yellow. In particular,
electron-rich PVK-threaded MIL-101 could effectively probe electron-poor
nitro compounds, especially 1,3,5-trinitrobenzene (TNP), a highly
explosive material. This sensing approach is a colorimetric methodology,
which is very simple and convenient for practical analysis and operation
