Ratiometric fluorescence In3+ sensing via In3+-triggered tautomerization: Its applications to water samples, live cells and zebrafish

Dongju Yun, Ju Byeong Chae, Haeri So, Trinh N. Do, Ki Tae Kim, Yelim Yi, Mi Hee Lim, Cheal Kim

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A novel ratiometric fluorescence sensor NCS ((E)-N-(furan-2-ylmethyl)-2-(2-hydroxybenzylidene)hydrazine-1-carbothioamide) was synthesized by a combination of furfuryl isothiocyanate bearing hydrazine and salicylaldehyde. Sensor NCS exhibited a ratiometric fluorescent response toward In3+ via thioamide tautomerization with blue-shifted emission from 484 to 444 nm in a near-perfect aqueous solution. NCS displayed a linear ratiometric relationship to micromolar concentrations (0–60 μM) of In3+ and the detection limit was found to be 2.68 μM. Moreover, sensor NCS exhibited an excellent selectivity for sensing In3+ in real samples as well as live cell and zebrafish. The sensing mechanism was demonstrated through UV–visible, fluorescent and 1H NMR titrations, Job's plot, ESI-MS and theoretical calculations.

Original languageEnglish
Article number108704
JournalDyes and Pigments
Volume183
DOIs
StatePublished - Dec 2020

Keywords

  • Bioimaging
  • Calculations
  • Fluorescence chemosensor
  • Indium
  • Ratiometric
  • Tautomerization

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