Synthesis and spectral investigation of some new crown ether ligands

Hayvali Z.

ASIAN JOURNAL OF CHEMISTRY, vol.15, no.2, pp.877-883, 2003 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 15 Issue: 2
  • Publication Date: 2003
  • Journal Name: ASIAN JOURNAL OF CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.877-883
  • Keywords: crown ether, Schiff base, tautomerism, UV-Vis spectroscopy, NICKEL GUEST CATIONS, SCHIFF-BASE TYPE, CRYSTAL-STRUCTURE, RECOGNITION SITES, COMPLEX-FORMATION, METAL-IONS, SODIUM, TAUTOMERISM
  • Ankara University Affiliated: Yes

Abstract

The new crown ether ligands (5-6) were synthesized by condensation of 4'-formyl-5'-hydroxybenzo-15-crown-5 (4) with 2-chloroaniline and 3-bromoaniline. The structure of these compounds have been elucidated on the basis of elemental analyses, IR, H-1, C-13 NMR, and UV-Vis spectroscopic techniques. The UV-V is spectra of the ligands (5-6) were studied in polar and non-polar solvents, as well as in acidic and basic media. The results indicate that the tautomeric equilibria (phenol-imine O-H...N and keto-amine O...H-N forms) are present only in the EtOH solution. But in other solvents (DMSO, CHCl3, n-hexane), acidic and basic media only the phenol-imino form is dominant.