Bifunctional calix[4]arene sensor for Pb(II) and Cr2O7(2-) ions

J Fluoresc. 2013 May;23(3):575-90. doi: 10.1007/s10895-013-1200-3. Epub 2013 Mar 6.


A readily available chromionophore 5,11,17,23-tetra-tert-butyl-25,27-bis(hydrazidecarbonylmethoxy)-26,28-dihydroxycalix[4]arene (HCC4) was employed as a chromogenic sensing probe selective for Pb(II) and Cr2O7(2-) ions among a series of various ions such as Li(I), Na(I), K(I), Rb(I), Ba(II), Sr(II), Al(III), Cd(II), Co(II), Cu(II), Hg(II), Ni(II), Pb(II) and Zn(II) as well as Cr2O7(2-), CH3CO2(-), Br(-), Cl(-), F(-), I(-), ClO4(-) and NO3(-) that have been examined by UV-visible and fluorescence spectroscopic techniques. The HCC4 in DCM-MeCN system forms 2:1 (ligand-metal) complex with Pb(II). It also shows 2:1 stoichiometry with Cr2O7(2-). The complexation phenomenon has been confirmed by FTIR spectroscopy that favors the selective nature of HCC4 with Pb(II) and Cr2O7(2-). Thermal gravimetric analysis (TGA) also supports its utility in drastic conditions.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Calixarenes / chemistry*
  • Chemistry Techniques, Analytical / instrumentation*
  • Chromates / analysis*
  • Chromates / chemistry*
  • Chromates / isolation & purification
  • Color
  • Hydrazines / chemistry*
  • Lead / analysis*
  • Lead / chemistry*
  • Lead / isolation & purification
  • Liquid-Liquid Extraction
  • Phenols / chemistry*
  • Solvents / chemistry
  • Spectroscopy, Fourier Transform Infrared


  • 5,11,17,23-tetra-tert-butyl-25,27-bis(hydrazidecarbonylmethoxy)-26,28-dihydroxycalix(4)arene
  • Chromates
  • Hydrazines
  • Phenols
  • Solvents
  • calix(4)arene
  • Calixarenes
  • Lead