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. 2018 Mar 29;11(4):523. doi: 10.3390/ma11040523

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© 2018 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) Schematic presentation of “OFF–ON” system for sensor H₄L (c = 1 × 10⁻⁵ M) in the existence of Cd²⁺ (c = 1 × 10⁻³ M) and EDTA (c = 1 × 10⁻³ M); (b) Performance of sensor H₄L in the INHIBIT gate mode in Tris-phosphate buffer (c = 0.2 M, DMF/H₂O = 9:1, v/v, pH = 7.0, λex = 373 nm). The bars display the fluorescent output of sensor H₄L at 373 nm in the existence of Cd²⁺ and EDTA serve as inputs.

(a) Schematic presentation of “OFF–ON” system for sensor H₄L (c = 1 × 10⁻⁵ M) in the existence of Cd²⁺ (c = 1 × 10⁻³ M) and EDTA (c = 1 × 10⁻³ M); (b) Performance of sensor H₄L in the INHIBIT gate mode in Tris-phosphate buffer (c = 0.2 M, DMF/H₂O = 9:1, v/v, pH = 7.0, λex = 373 nm). The bars display the fluorescent output of sensor H₄L at 373 nm in the existence of Cd²⁺ and EDTA serve as inputs.