A novel cationic iridium(iii) complex with a thiorhodamine-based auxiliary ligand: application for luminescent and colorimetric detection of Hg2+ in an aqueous solution. (18th July 2017)

• Record Type: Journal Article
• Authors: Chen, Zeyu; Meng, Guoyun; Tang, Huaijun; Ye, Yanchun; Sun, Riyong; Chen, Mingxian; Wang, Kai-Min
• Is Part Of: New journal of chemistry. Volume 41:Number 16(2017)
• Page Start: 8312
• Page End: 8319
• Publication Date: 2017-07-18
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c7nj00734e
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Detecting Hg 2+ in an aqueous solution with detection limits of 16 ppb by luminescence detection and 80 ppb by absorption detection. Abstract : A novel cationic iridium(iii ) complex [(SRB-DAF)Ir(ppy)2 ]PF6 (SRB-DAF: 2-((5 H -cyclopenta[1, 2- b :5, 4- b ′]dipyridin-5-ylidene)amino)-3′, 6′-bis(diethylamino)spiro[isoindoline-1, 9′-xanthene]-3-thione and ppy: 2-phenylpyridine) with a thiorhodamine-based auxiliary ligand was designed and synthesized. The spirolactam ring of the thiorhodamine group will be opened with the chelation of Hg 2+ ion, and the iridium(iii ) complex instantly exhibits remarkable "turn-on" type naked-eye detectable color ( λ max, abs = 567 nm) and phosphorescence ( λ max, em = 587 nm) changes. Hg 2+ can be detected by this iridium(iii ) complex with high selectivity and sensitivity in an aqueous solution in the presence of other metal cations (Ag +, Cu 2+, Fe 2+, Fe 3+, Mg 2+, Ni 2+, Ba 2+, Cr 3+, Ca 2+, Co 2+, Na +, Pb 2+, Zn 2+, Li +, Mn 2+, Al 3+, K + and Cd 2+ ) in the pH range 6.9–8.0. As a Hg 2+ probe, the iridium(iii ) complex exhibited low detection limits of 8.074 × 10 −8 M (16 ppb) by luminescence detection and 3.985 × 10 −7 M (80 ppb) by absorption detection.