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[Display omitted] • A highly sensitive Zn2+ and PPi sensor LP was synthesized based on bicarboxaminoquinoline. • LP showed well water solubility, the low LOD, fast response time, and wide linear range for sensing Zn2+ and PPi. • The INHIBIT logic gate was constructed by using the reversibility of LP. • LP was applied for the detection of Zn2+ and PPi in two real water samples and cells imaging. A new ratiometric fluorescent sensor (LP) based on bicarboxaminoquinoline was designed and synthesized for sequentially recognizing Zn2+ and PPi. In aqueous solution, LP exhibited the ratiometric fluorescence response towards Zn2+, along with the about 4-folds enhancement of fluorescence quantum yield. Subsequently, the LP -Zn2+ complex displayed the fluorescence recovery upon adding PPi through the displacement strategy. And the LODs of LP and its Zn2+ complex for sensing Zn2+ and PPi were found to be 15 nM and 5.5 nM, respectively. Notably, the reversibility of LP for sequentially sensing Zn2+ and PPi had been employed to construct the INHIBIT logic gate. Moreover, LP and its Zn2+ complex had been successfully utilized for the detection of Zn2+ and PPi in two real water samples and cells imaging. [ABSTRACT FROM AUTHOR]

A novel fluorescent sensor for Zn 2+ based on 8-oxalamidoquinoline (OAQ) was designed and synthesized. OAQ behaves high selectivity to Zn 2+ accompanied by remarkable emission enhancement (32 folds) at 490 nm upon binding Zn 2+ in buffer aqueous solution at pH 7.2. The results show that a 1:1 complex was formed and the apparent association constant of OAQ/Zn 2+ complex was calculated to be 2.5 × 10 5 M −1 . The detection limit was gained to be 2.0 × 10 −8 M. Furthermore, the fluorescent signals of OAQ are utilized to construct an INHIBIT logic gate at the molecular level. Additionally OAQ was successfully used for fluorescence imaging in living yeast cells. [ABSTRACT FROM AUTHOR]