首页|Highly sensitive fluorescence response of[2.2]paracyclophane modified D-A type chromophores to trace water,pH,acidic gases and formaldehyde
Highly sensitive fluorescence response of[2.2]paracyclophane modified D-A type chromophores to trace water,pH,acidic gases and formaldehyde
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Donor(D)-acceptor(A)type compounds have drawn significant attraction recently due to their large Stokes shifted emission and easy-tunable emissive behaviour.Herein,a new family of D-A type[2.2]paracyclophanyl 4H-pyran-4-one fluorescent molecules(3a-3d)have been rationally designed and easily synthesized,and they exhibited intensity and wavelength-based fluorescence sensing in response to active hydrogen,polarity,viscosity and acidic/basic vapours.Therefore,visual and quantitative detection of trace water in different organic solvents with low detection limits of 1.39-8.75 ppm were achieved for 3c; Fluorescence ratiometric detection of pH in the range of 2-7 was achieved for 3b.Moreover,3a-3d could be served as coated test strips for detecting acidic gases(HC1,TFA,HCOOH and SO2)and HCHO with high sensitivity,reversibility,reproducibility and long-time stability.The response times to TFA vapour were 3-5 s,to HCOOH vapour were 5-7 s and to HCHO vapour 32-70 s.These processes could be readily visualized by unaided eye detection under day light and UV-irradiation.Furthermore,the sensing mechanisms were elucidated by X-ray diffraction,NMR and TD-DFT calculations.The present results suggest that the coated test strips of 3a-3d have potential applications in data encryption and decryption and anti-counterfeiting fields.
D-A type chromophores[2.2]Paracyclophanyl 4H-pyran-4-oneTrace water determinationpH sensingAcidic gases and HCHO detection
Wenzeng Duan、Yanmin Huo、Honghan Ji
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School of Chemistry and Chemical Engineering,Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology,Liaocheng University,Liaocheng,25000,China
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