A Fluorescent and Colorimetric Chemosensor for Hg2+ Based on Rhodamine 6G With a Two-Step Reaction Mechanism

Abstract

A fluorescent and colorimetric chemosensor L based on rhodamine 6G was designed, synthesized, and characterized. Based on a two-step reaction, the chemosensor L effectively recognized Hg 2+ . The interaction between the chemosensor and Hg 2+ was confirmed by ultraviolet-visible spectrophotometry, fluorescence spectroscopy, electrospray ionization-mass spectrometry, Fourier-transform infrared spectroscopy, and frontier molecular orbital calculations. The chemosensor L was also incorporated into test strips and silica gel plates, which demonstrated good selectivity and high sensitivity for Hg 2+ .

Fused Nickel(II) Porphyrins—Sensing of Toxic Anions and Selected Metal Ions Through Supramolecular Interactions

“…Porphyrin-based chemosensors have been reported for cyanide (Xu et al, 2010 ), fluoride (Kubo et al, 2003 ), nitrite (Yang et al, 2014 ), azide (Zhang et al, 2012 ), chloride (Zhang et al, 2005 ), and phosphate anions (Rodrigues et al, 2014 ). Similarly, metal cations that have been detected using porphyrin chemosensors include zinc(II) (Zhang et al, 2007 ), nickel(II) (Malinski et al, 1990 ), mercury(II) (Zhang et al, 2002 ; Bai et al, 2020 ), iron(III) (Vlascici et al, 2012 ), copper(II) (Gupta et al, 2006 ), lead(II) (Bozkurt et al, 2009 ), and so on. Our research group has already reported sensors based on porphyrin analogs for cyanide ions, fluoride ions, and picric acid (Chahal and Sankar, 2017 ; Dar and Sankar, 2017 ; Rathi et al, 2017 ).…”

Novel Fluorescent Probe toward Fe3+ Based on Rhodamine 6G Derivatives and Its Bioimaging in Adult Mice, Caenorhabditis elegans, and Plant Tissues

“…According to the reported methods, N-(rhodamine 6G) lactam-ethylenediamine (A) was synthesized and purified by recrystallization from ethanol. 43 Then, A (460 mg, 1 mmol) and hippuric acid B (180 mg, 1 mmol) were dissolved in methylene chloride (25 mL) and also 4-dimethylaminopyridine (DMAP, 122 mg, 1 mmol) was added as a catalyst. The mixture was reacted at room temperature.…”

Recent Developments in Fluorescent Materials for Heavy Metal Ions Analysis From the Perspective of Forensic Chemistry

“…These methods focus on the design and synthesis of coordination ligand-contained fluorophores and the binding process for metal ions sensing in solution. Fluorescent sensors for Hg 2+ , Cu 2+ , Zn 2+ , Cd 2+ , Fe 3+ , Ni 2+ , Cd 2+ , and Cr 2+ are developed by conjunction with suitable probes containing the core fluorophores, such as rhodamine, pyrene, anthracene, naphthalimide, aminoquioline, bithiophene, and coumarin (Saleem et al, 2017 ; Sivaraman et al, 2018 ; Bai et al, 2019 , 2020 ).…”