Issue 35, 2014

Sequential recognition of zinc ion and hydrogen sulfide by a new quinoline derivative with logic gate behavior

Abstract

A Schiff base-type fluorescent chemosensor L has been synthesized and characterized to relay recognition of Zn2+ and H2S. Among various metal ions, only Zn2+ induces the fluorescence enhancement of the sensor L and results in an “Off–On” type sensing with excellent selectivity and high sensitivity in aqueous solution. The lowest detection limit for Zn2+ is 1 × 10−7 M. Density functional theory calculation for L and the resultant zinc complex is also performed in this study. The chemosensor also exhibits fluorescence quenching with Cu2+ in aqueous solution. Fluorescent changes of L upon the addition of Zn2+ and Cu2+ is utilized as an INHIBIT logic gate at the molecular level, using Zn2+ and Cu2+ as chemical inputs and the fluorescence intensity signal as the output. On the other hand, the consequent product of L and Zn2+, L–2Zn, is an excellent indicator for H2S for displacement of Zn2+ from the complex L–2Zn. Its H2S sensing behavior is not interfered with by reduced glutathione (GSH), L-cysteine (L-Cys), and even bovine serum albumin (BSA) indicates that L–2Zn is able to detect H2S without any distinct interference from these biological thiols. The addition of H2S leads to the fluorescence quenching of L–2Zn, forming an “On–Off” type sensing system. Therefore, the sensing process for Zn2+ and sequential detection of H2S is a reversible one, and also constitutes an “Off–On–Off” type fluorescence monitoring system. This Zn2+ and H2S sequential recognition via fluorescence relay enhancement and quenching give probe L the potential utility for Zn2+ and H2S detection in aqueous media and biological samples.

Graphical abstract: Sequential recognition of zinc ion and hydrogen sulfide by a new quinoline derivative with logic gate behavior

Supplementary files

Article information

Article type
Paper
Submitted
18 Dec 2013
Accepted
28 Feb 2014
First published
28 Feb 2014

RSC Adv., 2014,4, 18270-18277

Author version available

Sequential recognition of zinc ion and hydrogen sulfide by a new quinoline derivative with logic gate behavior

Z. Dong, X. Le, P. Zhou, C. Dong and J. Ma, RSC Adv., 2014, 4, 18270 DOI: 10.1039/C3RA47755J

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