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Issue 16, 2017
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A novel cationic iridium(III) complex with a thiorhodamine-based auxiliary ligand: application for luminescent and colorimetric detection of Hg2+ in an aqueous solution

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Abstract

A novel cationic iridium(III) complex [(SRB-DAF)Ir(ppy)2]PF6 (SRB-DAF: 2-((5H-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 Hg2+ ion, and the iridium(III) complex instantly exhibits remarkable “turn-on” type naked-eye detectable color (λmax,abs = 567 nm) and phosphorescence (λmax,em = 587 nm) changes. Hg2+ 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+, Cu2+, Fe2+, Fe3+, Mg2+, Ni2+, Ba2+, Cr3+, Ca2+, Co2+, Na+, Pb2+, Zn2+, Li+, Mn2+, Al3+, K+ and Cd2+) in the pH range 6.9–8.0. As a Hg2+ 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.

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

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Publication details

The article was received on 03 Mar 2017, accepted on 30 Jun 2017 and first published on 30 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ00734E
Citation: New J. Chem., 2017,41, 8312-8319
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    A novel cationic iridium(III) complex with a thiorhodamine-based auxiliary ligand: application for luminescent and colorimetric detection of Hg2+ in an aqueous solution

    Z. Chen, G. Meng, H. Tang, Y. Ye, R. Sun, M. Chen and K. Wang, New J. Chem., 2017, 41, 8312
    DOI: 10.1039/C7NJ00734E

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