Abstract
Cu2+ is the third most prevalent transition metal ion in critical biological systems, although it is poisonous to humans. As a result of this, establishing a mechanism for selectively detecting the Cu2+ ion in an aqueous medium is crucial. A new triphenylamine-pyrenyl salicylic acid probe (Compound 3) was produced utilizing the Sonograshira reaction, the Suzuki cross-coupling process combined with a hydrolysis reaction for Cu2+ detection with a fluorescent turn-off mode. In the presence of Cu2+, Compound 3 operated as both a highly selective and highly sensitive fluorescent Cu2+ sensor in a 100% aqueous medium. Consequently, the fluorescence intensity of Compound 3 showed a strong linear relationship with the Cu2+ ion concentration in the 10 to 1000 pM range. The detection limit of the approach was 5.22 pM, which was less than the maximum Cu2+ level in drinking water, as suggested by the US Environmental Protection Agency of 19 µM. (EPA). Therefore, Compound 3 was successfully used to determine the concentration of Cu2+ in real samples.
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