A fluorescent and colorimetric Schiff base chemosensor for the detection of Zn2+ and Cu2+: Application in live cell imaging and colorimetric test kit

Min Seon Kim, Tae Geun Jo, Minuk Yang, Jiyeon Han, Mi Hee Lim, Cheal Kim

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

A novel Schiff base chemosensor HMID, ((E)‑1‑((2‑hydroxy‑3‑methoxybenzylidene)amino)imidazolidine‑2,4‑dione), have been designed and synthesized. Sensor HMID showed a selectivity to Zn2+ through fluorescence enhancement in aqueous solution. Its detection limit was analyzed as 11.9 μM. Importantly, compound HMID could be applied to image Zn2+ in live cells. Detection mechanism of Zn2+ by HMID was suggested to be an effect of chelation-enhanced fluorescence (CHEF) by DFT calculations. Moreover, HMID could detect Cu2+ with a change of color from colorless to pink. The selective detection mechanism of Cu2+ by HMID was demonstrated to be the promotion of intramolecular charge transfer band by DFT calculations. Additionally, HMID could be employed as a naked-eye colorimetric kit for Cu2+. Therefore, HMID has the ability as a ‘single sensor for dual targets’.

Original languageEnglish
Pages (from-to)34-43
Number of pages10
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume211
DOIs
StatePublished - 15 Mar 2019

Keywords

  • Cell imaging
  • Chemosensor
  • Colorimetric
  • Copper ion
  • Fluorescent
  • Zinc ion

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