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. 2019 Jul 25;24(15):2711. doi: 10.3390/molecules24152711

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

(a) Photos showing the selective detection of nitrate by E1 via an observable emission turn-on. Reproduced with permission from [117]. Copyright 2015, the Royal Society of Chemistry. (b) Spectrophotometric and spectrofluorometric titration studies of E2a with nitrate, with photos showing the emission turn-on of E2a due to nitrate. Reproduced with permission from [65]. Copyright 2018, American Chemical Society.