Abstract
A fluorescent sensor based on diarylethene has been designed and synthesized. The sensor not only exhibited excellent photochromic properties, but also has distinguishing ability for Ca2+ and Sr2+ from other metal ions. Upon addition of Ca2+ and Sr2+, its emission intensity enhanced 27-fold and 24-fold respectively, accompanied by the emission peak shifted from 439 nm to 484 nm for Ca2+, and to 479 nm for Sr2+. The 1:1 stoichiometry between the sensor and the two ions was confirmed by Job's plot and HRMS. The LOD for Ca2+ and Sr2+ was determined to be 9.4 × 10−8 mol L−1 and 7.2 × 10−8 mol L−1, respectively. Furthermore, the sensor was applied in the detection of Ca2+ and Sr2+ in practical samples successfully.
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