Fluorescent Janus ring siloxanes for detection of Au(III) and L-cysteine
2
Issued Date
2022-12-01
Resource Type
ISSN
01437208
eISSN
18733743
Scopus ID
2-s2.0-85139315499
Journal Title
Dyes and Pigments
Volume
208
Rights Holder(s)
SCOPUS
Bibliographic Citation
Dyes and Pigments Vol.208 (2022)
Suggested Citation
Chaiprasert T., Chanmungkalakul S., Liu Y., Bureerug T., Silpcharu K., Unno M., Xiaogang L., Ervithayasuporn V., Chang Y.T., Rashatasakhon P. Fluorescent Janus ring siloxanes for detection of Au(III) and L-cysteine. Dyes and Pigments Vol.208 (2022). doi:10.1016/j.dyepig.2022.110793 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/84031
Title
Fluorescent Janus ring siloxanes for detection of Au(III) and L-cysteine
Other Contributor(s)
Abstract
Two new all-cis pyrene-substituted cyclic tetrasiloxanes (JR-01 and JR-02) are synthesized and studied as selective metal ion sensors. Both compounds exhibit solvent- and concentration-dependent excimer fluorescence emission at 482 nm. They also show highly selective fluorescence quenching by Au(III) ion with detection limits of 0.9 and 0.8 μM for JR-01 and JR-02, respectively. Data from the Stern-Volmer's plots at various temperatures, zetasizers, NMR, and UV–Vis spectroscopy indicate a plausible mechanism involving the formation of a non-emissive Au(III) complex. An application of JR-01 as Au(III) sensor in real water samples reveals a good sensing efficiency which is comparable to the analysis result from ICP-QMS. In addition, when an excess amount of L-cysteine is added to the JR-01/Au(III) mixture, the fluorescence signal is restored and the 1H NMR data suggests that JR-01 remains intact. As an extension of this study, we successfully demonstrate the detection of L-cysteine by fluorescence turn-on process using the JR-01/Au(III) mixture with a detection limit of 14.0 μM.