A colorimetric turn-on optical chemosensor for Cu2+ ions and its application as solid state sensor.

We report a novel coumarin based optical chemosensor (Probe 1 ) for the selective and sensitive detection of Cu 2+ ions in aqueous medium. The addition of Cu 2+ ions to Probe 1 shows distinct color change from light yellow to pinkish red color under visible light with the sensing limit of 1.54 μM. Moreover, practical utility of Probe 1 as solid state optical sensor (test paper, TLC plates) for sensing Cu 2+ has been demonstrated by instantaneous “naked eye” response. [ABSTRACT FROM AUTHOR]