Pleas De ad l to o nn oT tr aa nd sj au cs t ti omn sa rgins
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ARTICLE
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off ratio (Fig. S10). Therefore, further ECL experiments were
2
DOI: 10.1039/C8DT00309B
mainly conducted with
ECL measurements were performed in an acetonitrile/water
solution mixture (9:1 ratio) with 10 and 30 mM TPA with
.1 M TBAP as a supporting electrolyte. As shown in Fig. 8, the
ECL intensity decreased gradually until the concentration of
Hg(II) ion reached 40 M. A good linear relationship was
observed over the range of 0–40 M and the estimated limit of
detection (LOD) was 170 pM (signal–to–noise (S/N) ratio=3,
n=3). and also showed the decrement of ECL intensity until
M of Hg(II) ion was added (see Fig. S11 and Fig. S12). In this
case, twice the amount of Hg(II) ion was needed for saturation
compared to . Interestingly, the ECL intensity of decreased
exponentially upon the addition of Hg(II) ion. The estimated
limit of detection was 1.9 nM and 0.78 nM for and
9.
7
µM 9
0
µ
4
µ
1
2
5
2
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1
2,
respectively, which appear to be much smaller than the LOD
determined by photoluminescence.
Interestingly, all probes showed ECL quenching in the
presence of Hg(II) ion. This phenomenon might be inevitable as
the ECL process can occur only when proper oxidation is
allowed. However, the results of CV showed that after the
addition of Hg(II) ion, no significant oxidation peaks were
observed. Therefore, we can conclude that the proper oxidation
does not occur following the addition of Hg(II) ion which is
manifested as a quenching of the ECL intensity (Fig. S13).
5
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1 K. H. Lee, H. J. Kang, S. J. Lee, J. H. Seo, Y. K. Kim and S. S. Yoon,
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2 D. Wang, Y. Wu, B. Jiao, H. dong, G. Zhou, G. Wang, Z. Wu,
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3 Md. K. Nazeeruddin, R. Humphry–Baker, D. Berner, S. Rivier,
8
9
A selective binding assay of
Fig. 9. The ECL intensity certainly decreased only in the presence
of Hg(II) ion. The addition of other metal ions (50 M each), such
9 was carried out as shown in
µ
+
3+
2+
2+
2+
2+
2+
+
2+
2+
+
2+
as Ag , Al , Ca , Cd , Co , Cu , Fe , K , Mg , Mn , Na , Ni ,
Pb , and Zn , caused relatively small changes and the ECL
intensities remained high.
1
2+
2+
1
1
1
Conclusions
We demonstrated the first example, to the best of our
knowledge, of a phosphorescence and electrogenerated
chemiluminescence dual–mode chemodosimeters for Hg(II) ion
detection. In addition, we demonstrated the sensing
mechanism based on the selective reaction of Hg(II) ion with the
acetylacetonate ancillary ligand of Ir(III) complexes. We assert
that this strategy could emerge as a general tool for the
selective detection of Hg(II) ion.
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Conflicts of interest
There are no conflicts to declare.
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7
Acknowledgements
This work was supported by the National Research Foundation
18 H. Zeng, F. Yu, J. Dai, H. Sun, Z. Lu, M. Li, Q. Jiang and Y. Huang,
Dalton Trans., 2012, 41, 4878–4883; Q. Mei, Y. Shi, C. Chen,
Q. Hua and B. Tong, Inorg. Chem. Commun., 2016, 73, 147–
151.
(Grant No. 2015M3A6A4076701) funded by the MSIP.
1
9 H. J. Kim, K.–S. Lee, Y.–J. Jeon, I.–S. Shin and J.–I. Hong,
Biosens. Bioelectron., 2017, 91, 497–503.
Notes and references
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| J. Name., 2012, 00, 1-3
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