A highly selective fluorescence and absorption sensor for rapid recognition and detection of Cu²⁺ ions in aqueous solution and film

Abstract

A fluorescence and absorption chemosensor (SAAT) based on 5‐(hydroxymethyl)‐salicylaldehyde (SA) and o‐aminothiophenol (AT) was designed and synthesized. SAAT in DMSO–HEPES (20.0 mM, v/v, 1:99, pH = 7.0) solution shows a highly selective and sensitive absorption and an ‘on–off’ fluorescence response to Cu2+ ions in aqueous solutions over all other competitive metal ions including Na+, Ag+, Ba2+, Ca2+, Cd2+, Mg2+, Zn2+, Cr3+, Al3+, Hg2+, K+, Mn2+, Ni2+, Sr2+, Tb3+ and Co2+. SAAT exhibits ratiometric absorption sensing ability for Cu2+ ions. Importantly, SAAT also can sense Cu2+ ions using fluorescence quenching, the fluorescence intensity of SAAT showed a good linear relationship with Cu2+ concentration, and the detection limit of Cu2+ was 0.34 μM. The results of Job's plot, Benesi–Hildebrand plot, mass spectra, and density functional theory calculations confirmed that the selective absorption and fluorescence response were attributed to the formation of a 1:1 complex between SAAT and Cu2+. SAAT in test film could identify Cu2+ in water samples using the intuitive fluorescence colour change under a UV lamp. SAAT has great application value as a selective and sensitive chemosensor to discriminate and detect Cu2+ ions.

Quantification of tyramine in different types of food using novel green synthesis of ficus carica quantum dots as fluorescent probe

“…[ 16,17 ] The green quantum dots are considered the most sensitive and economical methods for analysis of varying products as pharmaceutical products, environmental pollutions, and food analysis. [ 18–20 ] Besides, the fluorometric technique is considered the most simple and sensitive approach for analysis of different products. [ 21,22 ]…”

“…[16,17] The green quantum dots are considered the most sensitive and economical methods for analysis of varying products as pharmaceutical products, environmental pollutions, and food analysis. [18][19][20] Besides, the fluorometric technique is considered the most simple and sensitive approach for analysis of different products. [21,22] In this study, the synthesis of Ficus carica quantum dots (fig fruits ) based on hydrothermal carbonization method to produce polyamine carbon quantum dots (PA@CQDs).…”

SDS‐capped 1‐pyrenecarboxaldehyde nanoprobe for selective detection of Cu2+ ion from water samples: Spectroscopic approach

“…According to the World Health Organization and United States Environmental Protection Agency, the tolerable intake limit for Cu 2+ ions in the human body is 1.3 μg/ml [9, 10]. However, high concentrations of copper can result in serious illness due to damage to the liver and kidney [11] and may cause conditions such as Alzheimer’s disease [12], Wilson’s disease [13], Parkinson's disease [14], prions disease [15] and diabetes [16]. Other health threats, such as Indian childhood cirrhosis and idiopathic copper toxicosis, have been reported due to the overloading of copper in children [17].…”