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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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. |
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ISSN: | 1144-0546 1369-9261 |
DOI: | 10.1039/c7nj00734e |