Preprint Article Version 1 This version is not peer-reviewed

Selective Colorimetric Sensors for Cyanide and Acetate Ion in Partially Aqueous Medium

Version 1 : Received: 27 March 2018 / Approved: 27 March 2018 / Online: 27 March 2018 (12:13:34 CEST)

How to cite: Singhal, D.; Gupta, N.; Singh, A.K. Selective Colorimetric Sensors for Cyanide and Acetate Ion in Partially Aqueous Medium. Preprints 2018, 2018030225 (doi: 10.20944/preprints201803.0225.v1). Singhal, D.; Gupta, N.; Singh, A.K. Selective Colorimetric Sensors for Cyanide and Acetate Ion in Partially Aqueous Medium. Preprints 2018, 2018030225 (doi: 10.20944/preprints201803.0225.v1).

Abstract

4-(thiazol-2-yldiazenyl)phenol (L1) and 2-((4-hydroxyphenyl) diazenyl)-5-nitrophenol (L2) based on azo phenol were synthesised and used as selective colorimetric sensor for CN- and AcO ion in DMSO/H2O-HEPES (v/v; 1:1, pH–7.3 ± 0.2) and showed good sensitivity with large red shifts and nanomolar detection limit for CN- and AcO- ion. The stoichiometry of L1 with CN/AcO ion was found to be 1:1 and L2 with CN/AcO ion was found to be 1:2. Binding constant for L1+ CN, L1 + AcO, L2 + CN and L2 + AcO were calculated by B-H plot as 1.6 × 103, 8.0 × 102, 8.4 × 103 and 1.7 × 102 respectively. L2 showed high selectivity towards CN ion with low detection limit of 81 nM and large binding constant. In addition, 1H NMR titration and DFT studies also supported the deprotonation mechanism of receptors in the presence of selective anions.

Subject Areas

chemosensors; CN− selective sensor; test strip sensor

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