A highly selective "turn-on" water-soluble fluorescent sensor for gallium ion detection. Issue 32 (1st June 2021)

• Record Type: Journal Article
• Authors: Wang, Pengfei; Meng, Fanda; Su, Hao; Liu, Lijie; Khan, Maroof Ahmad; Li, Hui
• Is Part Of: RSC advances. Volume 11:Issue 32(2021)
• Page Start: 19747
• Page End: 19754
• Publication Date: 2021-06-01
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra02582a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : In this work, a highly selective water-soluble "turn-on" fluorescent sensor for gallium ion recognition was reported. Abstract : In this work, a novel sensor, ( E )- N ′-(3-( tert -butyl)-2-hydroxybenzylidene)thiophene-2-carbohydrazide (1 ), based on salicylaldehyde and thiophene hydrazide moieties was designed and synthesized. The single-crystal structure of 1 was achieved and studied for understanding its functional properties. The interaction and recognition abilities of 1 with different metal ions were investigated. Sensor 1 showed excellent "turn-on" fluorescence with highly selective and specific recognition ability in the presence of gallium ions (Ga 3+ ) in an aqueous solution. The sensing behavior of 1 with Ga 3+ was also studied by photophysical experiments, ESI-MS analysis, and 1 H NMR titration. The limit of detection (LOD) and limit of quantification (LOQ) of 1 for the detection of Ga 3+ in an aqueous solution were calculated as 58 nM, and 192 nM, respectively. DFT calculations were carried out to optimize the configuration of 1 and 1–Ga 3+ complexes and rationalize the photophysical experimental data. Highly selective test strips based on sensor 1 were developed for Ga 3+ detection. Sensor 1 was also used to detect Ga 3+ in actual water samples, and a considerable recovery rate was obtained.