Aryl Ethynylpyrene as Fluorescent Sensors for Cyanide Ions in Aqueous Media. Issue 14 (15th April 2020)

• Record Type: Journal Article
• Authors: Vongnam, Kunnigar; Chansaenpak, Kantapat; Sukwattanasinitt, Mongkol; Rashatasakhon, Paitoon
• Is Part Of: ChemistrySelect. Volume 5:Issue 14(2020)
• Page Start: 4303
• Page End: 4306
• Publication Date: 2020-04-15
• Subjects: Cyanide -- fluorescence -- pyrene -- sensors; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202000821
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Three derivatives of aryl ethynylpyrene are successfully synthesized via a Sonogashira coupling‐Knoevenagel condensation sequence. Two of these compounds exhibit excellent selective fluorescent enhancement by CN − in aqueous media with detection limits of 0.066 and 0.087 μM. The 1 H‐NMR analysis suggests that the sensing mechanism involves a nucleophilic addition of CN − to the reactive olefinic group. In the solution phase, these sensors can be used for the determination of spiked CN − in real water samples at 5 and 10 μM with relative standard deviation of below 4 %. When fabricated into paper‐based sensors, they can be used to detect CN − in aqueous media at the micromolar levels by naked eyes. Abstract : Three derivatives of aryl ethynylpyrene are successfully synthesized via a Sonogashira coupling‐Knoevenagel condensation sequence. Two of these compounds exhibit excellent selective fluorescent enhancement by CN − in aqueous media with detection limits of 0.066 and 0.087 μM. The 1 H‐NMR analysis suggests that the sensing mechanism involves a nucleophilic addition of CN − to the reactive olefinic group. In the solution phase, these sensors can be used for the determination of spiked CN − in real water samples at 5 and 10 μM with relative standard deviation of below 4 %. When fabricated into paper‐based sensors, they can be used to detect CN − in aqueous media at the micromolar levels by naked eyes.