Journal
RSC ADVANCES
Volume 5, Issue 14, Pages 10505-10511Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra16347h
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Funding
- National Natural Science Foundation of China [21476029, 21176029]
- Natural Science Foundation of Liaoning Province [20102004]
- Program for Liaoning Excellent Talents in University [LJQ2012096]
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A new two dipicolyl amine (DPA) dangled 2,5-diphenyl-1,3,4-oxadiazole derivatized sensor L has been designed and synthesized. Sensor L displays excited state intramolecular proton transfer (ESIPT) properties in buffered water solution (HEPES 10 mM, pH = 7.4). L shows highly selective and ratiometric fluorescence responses to Zn2+ in a 1 : 2 binding ratio. Fluorescence spectra and H-1 NMR studies demonstrate that L binds Zn2+ ions through its amide form, which promoted the ESIPT emission enhancement. The in situ generated L-2Zn(2+) complex can serve as a relay recognition sensor toward PPi and S2- via further complexation and Zn2+ sequestering processes respectively. Thus, multi-analyte and relay recognition of L through modulating ESIPT has been achieved.
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