A selectively fluorescein-based colorimetric probe for detecting copper(II) ion

Jiangang Zhang, Li Zhang, Yanli Wei, Jun Ma, Shaomin Shuang, Zongwei CAI, Chuan Dong*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

28 Citations (Scopus)


A novel fluorescein derivative furfuraldehyde fluorescein hydrazone (FFH) has been synthesized by reacting fluorescein hydrazide with furfuraldehyde and characterized by 1H NMR, 13C NMR, MS and elemental analysis. Addition of Cu2+ to the solution of FFH results in a rapid color change from colorless to yellow together with an obvious new band appeared at 502 nm in the UV-vis absorption spectra. This change is attributed to the spirocycle form of FFH opened via coordination with Cu2+ in a 1:1 stoichiometry and their association constant is determined as 6.1 × 104 L mol-1. Experimental results indicate that the FFH can provide a rapid, selective and sensitive response to Cu2+ with a linear dynamic range 6.6-330 μmol/L. Common interferent ions do not show any interference on the Cu2+ determination. It is anticipated that FFH can be a good candidate probe and has potential application for Cu2+ determination in aqueous solution.

Original languageEnglish
Pages (from-to)731-736
Number of pages6
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Publication statusPublished - 25 Mar 2014

Scopus Subject Areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

User-Defined Keywords

  • Colorimetric
  • Copper
  • Fluorescein
  • Furfuraldehyde
  • Hydrazine
  • Probe


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