The fluorescent turn-on detection of metal ions is highly desirable for public health and environmental security. Herein. we report a rationally designed fluorescent probe (1) for the detection of Cu2+ synthesized by integrating 2-hydrazinylbenzothiazole with 3-acetyl-7-hydroxycoumarin. The probe alone is non-fluorescent due to the isomerization of C=N in the excited state. https://www.markbroyard.com/deal-time-caruso-s-rhodiola-tabs-50-discount-super-buy/