Abstract
A new diarylethene–rhodamine derivative (1O) has been synthesized. It displayed colorimetric and fluorometric sensing abilities toward Cu2+ in CH3CN-H2O (4/1, v/v) solution. The fluorescence and absorbance detection limits for Cu2+ were calculated to be 0.31μM and 0.28μM, respectively. More importantly, the 1O-Cu2+ complex showed highly selective and sensitive recognition toward arginine (Arg) with the detection limit as low as 2.2μM. Experiments also showed that the resulting 1O-Cu2+ complex could function as a reversible fluorescence photoswitch in the response to UV–vis light due to the fluorescence resonance energy transfer mechanism. Moreover, 1O could behave as a molecular “keypad lock” with different order of chemical inputs of Cu2+ and Fe3+.
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