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Design of a novel coumarin-based multifunctional fluorescent probe for Zn²⁺/Cu²⁺/S²⁻ in aqueous solution
Jing-Can Qin1, Zheng-Yin Yang1
1College of Chemistry and Chemical Engineering, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, PR China.
Abstract:
A multifunctional fluorescent chemosensor 7-(diethylamino)-coumarin-3-carbaldehyde-(2'-methylquinoline-4'-formyl) hydrazone (HL) has been designed and synthesized. The sensor shows significant fluorescence enhancement in the presence of Zn(2+), which might be mainly due to the restricted -CN isomerization process. In contrast, the fluorescence of the sensor is quenched by Cu(2+) attributed to the inherent paramagnetic species. More interestingly, the 'in situ' prepared L-Cu exhibits a selective response to S(2-) based on reversible formation-separation of complex L-Cu and CuS.
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