Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 115, Issue 42, Pages 12059-12064Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp206930v
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Funding
- National Natural Science Foundation of China [20874077]
- program for Changjiang Scholars and Innovative Research Team in University [IRT1030]
- Fundamental Research Funds for the Central Universities
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A new cyano-substituted poly(p-phenylenevinylene) (PPV) derivative, MEOPS-CNPPV, is synthesized through Knoevenagel condensation of anionic diacetonitrile and neutral dialdehyde and characterized by H-1 NMR, IR, elemental analysis, and gel-permeation chromatography (GPC). To our knowledge, the polymer is the first water-soluble red-emitting PPV derivative. The absorption and emission wavelength of this water-soluble conjugated polymer (CP) depend on the solvent. In buffer solution, the fluorescence of MEOPS-CNPPV is quenched by cationic dinitrobenzene derivatives. Further research indicates that dinitrobenzene derivative with a more flexible structure exhibits a larger K-sv. Making use of the charge reversal of dinitrobenzene-modified substrate, a turn-on method is developed for AChE activity assay with the new polymer as a fluorophore. This convenient and direct fluorometric assay thus provides a platform for novel red-emitting sensory systems.
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