Synthesis of D-A Type Triphenylamine Sulfone/Ketone Fluorescent Polymers and Their Application in TNT Detection
To obtain a rapid and economical synthesis method for triphenylamine polymers,the inexpensive commercial materials N,N'-diphenyl-p-phenylenediamine and 4,4'-difluorodiphenyl sulfone/4,4'-difluorobenzophenone were employed to swiftly synthesize D-A type triphenylamine polymers(PTPAS and PTPAK)through a simple C-N one-step coupling reaction.These polymers form a unique donor-acceptor electronic structure with sulfone/carbonyl groups as acceptors and triphenylamine as donors.Both polymers exhibit excellent thermal stability,and research on their photophysical properties has found that they both possess fluorescent characteristics based on the intramolecular charge transfer effect.The fluorescence emission of PTPAS and PTPAK is mainly domina-ted by the first transition mode.Systematic research demonstrates that both polymers exhibit high sensitivi-ty towards TNT,with Stern-Volmer constants of 7.40×104 L/mol and 1.66×105 L/mol,respectively,and detection limits as low as 0.57 μ.mol/L and 0.25 μmol/L.Additionally,PTPAS and PTPAK exhibit anti-interference ability in response to TNT,almost unaffected by metal ions and other nitro explosives in the environment.
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