A Lawsone–DAMN based colorimetric chemosensor for rapid naked-eye detection of mercury(ii). (13th June 2016)

• Record Type: Journal Article
• Authors: Patil, Sharad R.; Choudhary, Amol S.; Sekar, Nagaiyan
• Is Part Of: New journal of chemistry. Volume 40:Number 8(2016:Aug.)
• Page Start: 6803
• Page End: 6811
• Publication Date: 2016-06-13
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c6nj00430j
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : A highly sensitive and selective chemosensorL exhibited well-defined naked-eye visible color changes from yellow to pink, which was used for Hg 2+ detection in acetonitrile. For the selective recognition of Hg 2+ ions, it forms a 1 : 1 stoichiometric complex involving naphthoquinone hydroxyl and diaminomaleonitrile nitrogen functionalities. Abstract : We designed and synthesized a new colorimetric chemosensorL based on the combination of 3-hydroxy-1, 4-dioxo-1, 4-dihydronaphthalene-2-carbaldehyde2 and diaminomaleonitrile3 moieties. The recognition abilities of the probe with a range of metal ions were evaluated and their optical properties have been systematically investigated. ChemosensorL exhibited well defined naked-eye visible color changes from yellow to pink for Hg 2+ detection in acetonitrile. Other ions, including Na +, Ca 2+, CO 2+, Ni 2+, Cu 2+, Mn 2+, Sn 2+, Hg 2+, Fe 3+, and Th 4+, had a negligible influence on the probe behaviour. The limit of detection (LOD) was 1.1 × 10 −7 M using the UV-vis changes. For the selective recognition of Hg 2+ ions, it forms a 1 : 1 stoichiometric complex involving naphthoquinone hydroxyl and diaminomaleonitrile nitrogen functionalities. The complex formation was proposed to be in a 1 : 1 ratio based on Job's plot, 1 H NMR titrations, ESI-mass spectrometry analysis and DFT calculations. Test strips based onL were fabricated, which could act as convenient and efficient Hg 2+ test kits. The results consistently indicated that Lawsone–DAMN is an ideal sensor, which can be utilised to monitor Hg 2+ in solution over a wide pH range.