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. 2019 Jul 3;9(7):974. doi: 10.3390/nano9070974

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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/).

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(a) The fluorescence detection mechanism of Cd–PPCA for Hcy. (b) the coordinated environment of the Cd²⁺ in Cd–PPCA (Top); a two-dimensional double-layer structure composed of Cd²⁺ and ligands of ppca and H₃tca (bottom-left); the Connolly surface of the framework of Cd–PPCA (bottom-right). (c) The fluorescence spectra of Cd–PPCA upon addition of different amounts of Hcy. (d) Results for selectivity and competition tests. Reproduced with permission from [100]. Copyright the Royal Society of Chemistry, 2018.