Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 16, 2012
Previous Article Next Article

A highly selective sulfur-free iridium(iii)-complex-based phosphorescent chemidosimeter for detection of mercury(ii) ions

Author affiliations

Abstract

A neutral phosphorescent coordination compound bearing a benzimidazole ligand, Ir(pbi)2(acac) (Hpbi = 1,2-diphenyl-1H-benzo[d]imidazole; Hacac = acetylacetone), is demonstrated to be the first example of a sulfur-free iridium complex for the detection of Hg2+ cations with high selectivity and sensitivity. Ir(pbi)2(acac) shows a multisignaling response towards mercury(II) ions through UV-vis absorption, phosphorescence and electrochemistry measurements. Upon addition of Hg2+ ions, solutions of this complex change from yellow to colorless, which could be observed easily by the naked eye, while its phosphorescence turns from bright green (λPLmax = 520 nm) into faint skyblue (λPLmax = 476 nm), and the detection limit is calculated to be 2.4 × 10−7 mol L−1. 1H NMR spectroscopic titration as well as ESI-MS results indicate that the decomposition of Ir(pbi)2(acac) in the presence of Hg2+ through rupture of Ir–O bonds is responsible for the significant variations in both optical and electrochemical signals.

Graphical abstract: A highly selective sulfur-free iridium(iii)-complex-based phosphorescent chemidosimeter for detection of mercury(ii) ions

Back to tab navigation

Supplementary files

Article information


Submitted
05 Nov 2011
Accepted
07 Feb 2012
First published
08 Mar 2012

Dalton Trans., 2012,41, 4878-4883
Article type
Paper

A highly selective sulfur-free iridium(III)-complex-based phosphorescent chemidosimeter for detection of mercury(II) ions

H. Zeng, F. Yu, J. Dai, H. Sun, Z. Lu, M. Li, Q. Jiang and Y. Huang, Dalton Trans., 2012, 41, 4878
DOI: 10.1039/C2DT12120D

Social activity

Search articles by author

Spotlight

Advertisements