A novel cationic iridium(iii) complex with a thiorhodamine-based auxiliary ligand: application for luminescent and colorimetric detection of Hg2+ in an aqueous solutionElectronic supplementary information (ESI) available. See DOI: 10.1039/c7nj00734e

A novel cationic iridium( iii ) complex [(SRB-DAF)Ir(ppy) 2 ]PF 6 (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 synthes...

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Hauptverfasser: Chen, Zeyu, Meng, Guoyun, Tang, Huaijun, Ye, Yanchun, Sun, Riyong, Chen, Mingxian, Wang, Kai-Min
Format: Artikel
Sprache:eng
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Zusammenfassung:A novel cationic iridium( iii ) complex [(SRB-DAF)Ir(ppy) 2 ]PF 6 (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. Detecting Hg 2+ in an aqueous solution with detection limits of 16 ppb by luminescence detection and 80 ppb by absorption detection.
ISSN:1144-0546
1369-9261
DOI:10.1039/c7nj00734e