Highly selective and sensitive colorimetric probe for hydrogen sulfide by a copper (II) complex of azo-dye based on chemosensing ensemble approach

Spectrochim Acta A Mol Biomol Spectrosc. 2012 May;90:35-9. doi: 10.1016/j.saa.2012.01.013. Epub 2012 Jan 16.


A copper (II) complex of azo-dye (Cu-1) has been synthesized by the reaction of 1-(2-pyridylazo)-2-naphthol (1) with copper (II) chloride. The complex Cu-1 is able to selectively sense hydrogen sulfide over other anions followed by the release of compound 1 to give a remarkable change of UV-vis absorption at neutral pH in aqueous solution.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Azo Compounds* / chemistry
  • Biosensing Techniques*
  • Colorimetry*
  • Coloring Agents* / chemistry
  • Copper / chemistry*
  • Hydrogen Sulfide / chemistry*
  • Hydrogen-Ion Concentration
  • Naphthols / chemistry*
  • Spectrophotometry, Ultraviolet
  • Water


  • Azo Compounds
  • Coloring Agents
  • Naphthols
  • Water
  • 1-(2-pyridylazo)-2-naphthol
  • Copper
  • Hydrogen Sulfide