Dehydroacetic acid Derived Schiff base as Selective and Sensitive Colorimetric Chemosensor for the Detection of Cu(II) ions in Aqueous Medium

Vashisht, Devika; Sharma, Shikha; Kumar, Rakesh; Saini, Vaneet; Saini, Vikram; Ibhadon, Alex; Sahoo, Subash Chandra; Sharma, Shweta; Mehta, S K; Kataria, Ramesh

Abstract

14 The deficiency, as well as overconsumption of essential metal ions, has serious health 15 implications. Hence, the design and synthesis of sensors for accurate detection of such ionic 16 species are of great significance. We report the synthesis and characterization of a yellow-17 coloured Dehydroacetic acid-based chemosensor DHB ((E)-N-(1-(2-hydroxy-6-methyl-4-oxo-18 4H-pyran-3-yl) ethylidene) benzohydrazide for a quick and affordable copper detection. A 19 naked-eye visible colour transition from light yellowish to bluish green was observed instantly 20 following Cu 2+ addition. DHB did not yield colour change with any other ionic species indicating 21 its specificity. The binding of DHB to Cu 2+ caused a blue shift accompanied by an increased 22 intensity due to an intramolecular charge transfer (ICT). No interference from competitive ionic 23 species reiterated the selectivity of this probe. The outcomes of single-crystal X-ray analysis, 24 titration studies, and Job's plot indicated a 1:2 stoichiometry between Cu 2+ and DHB. The 25 experimental results matched well with the theoretical results obtained from Density Functional 26 Theory (DFT) calculations. The practical applicability of the probe for Cu 2+ estimation was 27 further determined using water samples from various sources. The sensor could detect copper as 28 low as 0.156 í µí¼‡M in an aqueous media which is very less than the permissible value of 20 í µí¼‡M in 29 water. 30 31 32 33 2

Citation

Vashisht, D., Sharma, S., Kumar, R., Saini, V., Saini, V., Ibhadon, A., Sahoo, S. C., Sharma, S., Mehta, S. K., & Kataria, R. (2020). Dehydroacetic acid Derived Schiff base as Selective and Sensitive Colorimetric Chemosensor for the Detection of Cu(II) ions in Aqueous Medium. Microchemical journal, 155, Article 104705. https://doi.org/10.1016/j.microc.2020.104705

• Journal Article Type: Article
• Acceptance Date: Feb 5, 2020
• Online Publication Date: Feb 7, 2020
• Publication Date: 2020-06
• Deposit Date: Dec 19, 2019
• Publicly Available Date: Feb 8, 2021
• Journal: Micro-chemical journal
• Print ISSN: 0026-265X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 155
• Article Number: 104705
• DOI: https://doi.org/10.1016/j.microc.2020.104705
• Keywords: Colorimetric detectionCu(II)Schiff's base; Chemosensor; Dehydroacetic acid; DFT calculations; X-ray diffraction
• Public URL: https://hull-repository.worktribe.com/output/3327942
• Additional Information: Article details pending
• Contract Date: Dec 19, 2019