Iridium (III) complex-based fluorescent probe for detection of thiophenols and its application in water samples. (April 2019)

• Record Type: Journal Article
• Authors: Lu, Haiyue; Zhang, Daobin; Fan, Congbin; Guo, Yaqian; Xia, Xiaoli; Pu, Shouzhi
• Is Part Of: Dyes and pigments. Volume 163(2019)
• Page Start: 138
• Page End: 144
• Publication Date: 2019-04
• Subjects: Thiophenol -- Fluorescent probe -- Iridium(III) complex -- 2, 4-Dinitrobenzenesulfonamide; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2018.11.051
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: In consideration of the nucleophilic capacity of thiophenols, which could cleave sulfonamide bond under neutral conditions, a cyclometalated iridium(III) complex (probe1 ) comprised 2, 4-dinitrobenzenesulfonamide (DNBS) as the recognition unit was designed and synthesized to high selectivity and sensitivity detect thiophenols successfully based on internal charge transfer (ICT) mechanism. Upon addition with thiophenols to 20% DMSO/PBS solution of nearly non-fluorescent probe1 (10 μM, pH = 7.4), fluorescent product (complex2 ) was formed after cleavage of DNBS group and a significant emission enhancement at 470 nm was observed. In addition, it could be successfully applied to detect thiophenol in water samples with a high recovery, confirming its practical value in environment science. Graphical abstract: A cyclometalated iridium (III) complex comprised 2, 4-dinitrobenzenesulfonamide (DNBS) as the recognition unit (probe1 ) was synthesized and its fluorescent behaviors toward thiophenols in 20% DMSO/PBS solution and water samples were investigated systematically. The results demonstrated that probe1 could serve as a sensitive and selective fluorescent probe to detect thiophenols and could not be disturbed by aliphatic thiols. Highlights: A iridium (Ⅲ) complex probe comprised 2, 4-dinitrobenzenesulfonamide as recognition unit was designed and synthesized. Its detection behaviors toward thiophenols in 20% DMSO/PBS and water samples were investigated systematically. The mechanisms of recognition of thiophenols had been discussed through 1 H NMR spectrum.