Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 242, Issue -, Pages 849-856Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.09.173
Keywords
Dual-channel determination; Relay recognition; Cu2+ and H2PO4-; ESIPT; INHIBIT logic gate
Funding
- National Natural Science Foundation of China [21161018, 21262032, 21574104]
- Program for Chang jiang Scholars and Innovative Research Team in University of Ministry of Education of China [IRT1177]
- Natural Science Foundation of Gansu Province [1010RJZA018]
- Youth Foundation of Gansu Province [2011GS04735]
- [NWNU-LKQN-11-32]
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Organic molecular sensors have the advantage of being used through easy, fast, economical and reliable optical methods for detecting toxic metal ions in the environment. In the present work, a simple but specific organic ligand N,N-(3,3'-dimethyl biphenyl)-bis(4-diethylaminosalicyladimine) (Q2) was designed and synthesized according to the excited state intramolecular proton transfer (ESIPT). Q2 can be regarded as a colorimetric and fluorescent sensor for relay recognition of Cu2+ and H2PO4- in DMSO/H2O (8:2, v/v) HEPES buffer solutions. Moreover, sensor Q2 showed a highly sensitive and selective response towards Cu2+ and H2PO4- over other metal ions and anions. Particularly, the fluorescence ON-OFF-ON responding circle could be repeated over 4 times by the sequential addition of Cu2+ and H2PO4-. Notably, the actual usage of sensor Q2 was further demonstrated by test kits and silica gel plates. The fluorescence changes of Q2 upon the addition of Cu2+ and H2PO4- were utilized as an INHIBIT logic gate at the molecular level, using Cu2+ and H2PO4- as chemical inputs and the fluorescence intensity signal as the output. (C) 2016 Elsevier B.V. All rights reserved.
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