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. 2017 Jan 25;22(2):200. doi: 10.3390/molecules22020200

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© 2017 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 benzothiazole coumarin moiety 24 that combines with β-CD and Cu²⁺ to form an inclusion complex; (b) The complex of 24, β-CD and Cu²⁺ in which the 465 nm emission band of 24 is quenched, thus affording a selective turn-off response to Cu²⁺ [99]; (c) Triazole-tetraphenylethylene (TPE) functionalised β-CD 25 is a turn-on probe for Cd²⁺, which causes a significant increase in the fluorescence emission at 476 nm [100].