Diazo-coupled calix[4]arenes for qualitative analytical screening of metal ions

Tae Hyun Kim, Su Ho Kim, Le Van Tan, Yunyan Dong, Hasuck Kim, Jong Seung Kim

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


New chromogenic diazophenylcalix[4]arenes 1 and 2 were synthesized in cone conformation. Compound 1 with the ortho-carboxyl groups in CH3CN solution preferentially binds with alkaline earth and transition metal ions, whereas no significant changes in absorption spectra are observed in the presence of alkali metal ions. While 2 with the ortho-ester groups shows selective complexation properties towards transition metal ions over alkali and alkaline earth metal ions. The detection of metal ions gives rise to bathochromic shifts in the absorption spectra (from orange/yellow to red), which is clearly visible even to the naked eye. According to the selective color changes using both receptors upon cation complexation, one can set up a qualitative analytical routine to screen alkali, alkaline earth, and transition metal ions.

Original languageEnglish
Pages (from-to)1654-1658
Number of pages5
Issue number5
Publication statusPublished - 2008 Feb 15


  • Calix[4]arenes
  • Chromoionophores
  • Complexation
  • Metal ion

ASJC Scopus subject areas

  • Analytical Chemistry


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