The synthesis and fluorescence detection properties of benzoquinone-based conjugated microporous/mesoporous polymers

• DBQP and DBQN were synthesized by solution polymerization and miniemulsion polymerization, respectively.
• The DBQP and DBQN could be utilized as fluorescent chemosensors for picronitric acid (PA) in acetone suspension with good sensitivity and selectivity.
• The SV constant (KSV) of DBQP and DBQN are 9.02 × 104 and 1.79 × 104 L mol−1 for PA in acetone suspension, respectively.
• The detection limit of DBQP and DBQN for PA in acetone was found to be 3.33 × 10−18 and 2.48 × 10−13 mol L−1, respectively.

The benzoquinone-based conjugated microporous/mesoporous polymers were synthesized through Sonogashira–Hagihara cross-coupling with tetrabromo-1,4-benzoquinone (TBrBQ) and 1,4-diethynylbenzene (DEB) by both solution polymerization (DBQP) and miniemulsion polymerization (DBQN). The Brunauer–Emmett–Teller (BET) surface areas of these polymers were 356 and 25 m2 g−1 and pore average diameter were concentrated at around 2.12 and 3.84 nm for DBQP and DBQN, respectively. The two dimensional π-conjugated polymer frameworks could be combined with permanent microporous/mesoporous, luminescent properties and abundant oxygen atoms in the skeleton. Fluorescence studies found that both DBQP and DPQN could be utilized as fluorescent chemosensors for picronitric acid (PA) in acetone suspension.

Figure optionsDownload as PowerPoint slide