Visual sensing of CO2 in air with a 3-position modified naphthalimide-derived organogelator based on a fluoride ion-induced strategy

摘要

A new low-molecular-weight organic gelator derived from butyl naphthalimide having a naphthyl group attached at the 3-position with the amido linkage was synthesized. The synthesized gelator could form stable gels in several organic solvents. Scanning electron microscopy (SEM), temperature-dependent H-1 NMR spectra, UV-vis spectroscopy, and PXRD were involved in the characterization of the obtained gels. Furthermore, the solution derived from the stimuli of fluoride ions to the DMSO gel were found to allow a naked-eye sensing of CO2 stream through the solution-to-gel transition, as well as the quantitative analysis via fluorescence enhancement. Moreover, the present sensing system could also detect CO2 directly in air via the phase transformation which could provide a visual means for CO2 sensing in a confined space.