Synthesis and characterization of water-soluble zinc(II) Schiff-base complexes derived from amino acids and 3-formyl-4-hydroxybenzyl- triphenylphosphonium chloride

Boghaei, D. M ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1080/00958970701792794
  3. Publisher: 2008
  4. Abstract:
  5. Tridentate Schiff-base ligands derived from condensation of 3-formyl-4-hydroxybenzyl-triphenylphosphonium chloride with glycine, L-alanine, L-valine, L-leucine and L-phenylalanine in the presence of Zn(OAc)2·2H2O form five new water-soluble Zn(II) complexes, which were characterized by elemental analyses, IR, electronic absorption and 1H, 13C NMR spectroscopies. In the IR spectra of the complexes, the difference between the asymmetric and the symmetric carboxylate stretching frequencies is larger than ∼210 cm-1, which implies that the carboxylate groups are monodentate. UV-Vis electronic absorption studies show that Zn(II) functions as a trap for the Schiff-base intermediate. Schiff-base complexes formation were confirmed by the appearance of new signals in the 1H NMR for the azomethine hydrogen at ∼8 ppm and condensed L-amino acids at 3.4-3.8 ppm (C(3)-H). These complexes are formed through coordination of the ONO from the carboxyl, imino and phenoxy groups of the ligands to Zn(II). © 2008 Taylor & Francis
  6. Keywords:
  7. Schiff-base complexes ; 3-Formyl-4-hydroxybenzyl-triphenylphosphonium chloride ; Amino acids ; Zn(II) complexes
  8. Source: Journal of Coordination Chemistry ; Volume 61, Issue 12 , 2008 , Pages 1917-1926 ; 00958972 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/00958970701792794?journalCode=gcoo20