4.7 Article

New NIR spectroscopic probe with a large Stokes shift for Hg2+ and Ag+ detection and living cells imaging

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2022.120916

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Near infrared; Fluorescence probe; Stokes shift; Mercury(II); Silver(I)

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A new NIR probe CL was synthesized for simultaneous fluorescent turn-on and colorimetric detection of Hg2+ and Ag+. The probe showed significant color changes and fluorescence enhancement when detecting Hg2+ and Ag+, indicating potential applications in this field.
A new near-infrared (NIR) probe based on a coumarinyl ligand (CL) was designed and synthesized. The probe CL can be used for simultaneous fluorescent turn-on and colorimetric detection of Hg2+ and Ag+ in ethanol/water medium. Colorless solution of probe CL changed to light yellow or dark yellow after addition of Hg2+ or Ag+ ions. Meanwhile the maximum absorption band shifted from 379 nm to 404 nm and the intensity increased enormously (for Hg2+) or moderately (for Ag+). Probe CL displayed an extraordinarily large Stokes shift of 316 nm and addition of Hg2+ or Ag+ to probe CL induced enhancement in the intensity of fluorescence emission at 695 nm by 15 or 8 fold. The detection limit of CL for Hg2+ and Ag+ ions is 0.83 and 8.8 lM, respectively. The applicable pH for sensing Hg2+ by probe CL is in a broad range of 2-12. Application of probe CL for in vitro U87MG cell imaging to detect Hg2+ ions was confirmed. (C) 2022 Elsevier B.V. All rights reserved.

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