Citation:
Wu Linhua, Han Lifeng, Ta Honggui. Synthesis of 4-Amino-7-nitrobenzo-2-oxa-1, 3-oxadiazole Derivative and Its Recognition Behavior towards Hg (Ⅱ)[J]. Chemistry,
;2017, 80(7): 667-671.
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A novel 4-amino-7-nitrobenzo-2-oxa-1, 3-oxadiazole derivative (NBD-OEt) were synthesized via two steps by using 4-chloro-7-nitrobenzo-2-oxa-1, 3-diazole(NBD-Cl), ethylenediamine and ethyl bromoacetate as raw materials. The structure of NBD-OEt was confirmed by 1H NMR, 13C NMR and ESI-MS. The response to Hg2+ in HEPES aqueous buffer system containing 40% ethanol at pH 7.40, and the binding mode of NBD-OEt with Hg2+ were investigated. The results showed that the addition of Hg2+ could induce the red-shift of absorption band from 476 nm to 514 nm. Two clear isoabestic point were observed at 347 nm and 482 nm. With increasing the concentration of Hg2+, the weak fluorescence emission peak at 536 nm of NBD-OEt was intensified and red shifted to 559 nm with a obvious isoemission at 525 nm. Job's test showed that receptor NBD-OEt coordinate to Hg2+ in a 1:1 stoichiometry.
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Keywords:
- NBD-OEt,
- Cation Recognition,
- Fluorescence Recognition,
- Mercury Ion
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