Two novel fluorescent naphthalimide-based sensors as ion sensor and acidichromic colorant are synthesized. This naphthalimide fluorophore is functionalized via a condensation reaction in which dithiodioxomonoaza-based crown-containing phenyl units are conjugated to the naphthalimide core as a trapper for detecting acids in the gas phase and heavy metal ions Hg2+. It shows a selective chromogenic behavior toward Hg2+ ion by changing the color of the solution. It also can be found that both on a solid polycarbonate film and in solution show acidichromism, i.e. a reversible color change upon alternatively exposing the films or solution to HCl and NH3 gases, respectively. In this proposal, the designed sensors have been developed for the colorimetric and fluorescent determination by UV-Vis and fluorescence spectroscopy, and visual detection by the naked-eye. The visual detection provides a simple, rapid and sensitive method and was used for the detection of gaseous acids and Hg2+ ion in environmental applications.

Synthesis of acidichromic Hg2+-sensing properties of novel naphthalimide derivatives

246th National Meeting (2013)

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