A novel histidine-functionalized 1,8-naphthalimide-based fluorescent chemosensor for the selective and sensitive detection of Hg²⁺ in water

Abstract

A novel water soluble fluorescent sensor was synthesized by employing the carboxyl and imidazolyl moiety as the hydrophilic group site and Hg2+ binding site, whereas a naphthalimide moiety was used as the signal group.

Synthesis, Photophysical Properties, and Metal-Ion Recognition Studies of Fluoroionophores Based on 1-(2-Pyridyl)-4-Styrylpyrazoles

“…30 However, the LOD calculated in this work is a value that is in the same order of magnitude compared with other chemosensors recently reported in the literature. 31−33 In order to determine the stoichiometry of the complex, the Job’s plot study of the fluorescence emission for 3b –Hg 2+ interaction was made. This curve showed a maximum around 0.3 indicating the formation of complex 3b :Hg 2+ with a molar ratio that can be between 2:1 and 3:1 (Figure 6).…”

“…The value of the LOD is higher than the permitted level in drinking water according to the EPA standard in the United States (2 ppb, 2.0 × 10 –6 g/L) and to the amount allowed in accordance with Resolution 2115 of 2007 of the Ministry of Environment of the Government of Colombia (1.0 × 10 –6 g/L) . However, the LOD calculated in this work is a value that is in the same order of magnitude compared with other chemosensors recently reported in the literature. − In order to determine the stoichiometry of the complex, the Job’s plot study of the fluorescence emission for 3b –Hg 2+ interaction was made. This curve showed a maximum around 0.3 indicating the formation of complex 3b :Hg 2+ with a molar ratio that can be between 2:1 and 3:1 (Figure ).…”

Rhodamine‐based Colorimetric and Fluorescent Chemosensors for the Detection of Cu2+ Ions and its Application to Bioimaging

“…When these chemosensors encounter a metal ion in solution (organic or aqueous solution), a change in their optical characteristic is observed, such as a change in wavelength, a change in emission intensity, or the appearance of a novel fluorescence band . Varied fluorophores with different excitation and emission wavelengths have been employed for this purpose, such as xanthone (rhodamine and fluorescein), anthraquinone, quinolone, acridinone, coumarin, 1,8‐naphthalimide, 4‐amino‐7‐nitrobenzoxa‐1,3‐diazole (ANBD), and 4,4‐difluoro‐4‐bora‐3a,4a‐diaza‐s‐indacene (BODIPY) …”