A new family of NxOx pyridine-containing macrocycles: Synthesis and characterization of their Y(III), Ln(III), Zn(II), and Cd(II) coordination compounds

Carlos Lodeiro, Rufina Bastida, Emilia Bértolo, Adolfo Rodríguez

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30 Citations (Scopus)

Abstract

Reaction between 2,6-bis(2-formylphenoxymethyl)pyridine and N,N-bis(3-aminopropyl)methylamine or tris(2-aminoethyl)amine has been used as the starting point for the synthesis of seven oxa-aza macrocyclic ligands, five of them never reported previously. They all feature different pendant arms, which provide a wide range of coordination possibilities. The Schiff base macrocycles L1 and L4 and their reduced ligands L 2 and L5 are derived from 2,6-bis(2-formylphenoxymethyl) pyridine and tris(2-aminoethyl)amine or N,N-bis(3-aminopropyl)methylamine, respectively. The reaction of L1 with salicylaldehyde forms L 3, which features an imine bond in the pendant arm. The ligand L 5 has been the precursor for the pendant-armed L6 and L7, by alkylation of the free NH groups with methyl-imidazole or methyl-indole. By a template or a nontemplate approach, we have synthesized different mono- and dinuclear complexes with Y(III), Ln(III), Zn(II), and Cd(II) cations. Both the free macrocyclic ligands and their corresponding metal complexes have been characterized by microanalysis, IR, UV-vis, 1H and 13C NMR spectroscopy, FAB mass spectrometry, MS electrospray, and conductivity measurements.

Original languageEnglish
Pages (from-to)437-447
Number of pages11
JournalCanadian Journal of Chemistry
Volume82
Issue number3
DOIs
Publication statusPublished - 1 Mar 2004

Keywords

  • Lanthanide(III) complexes
  • Macrocyclic ligand complexes
  • Schiff-base macrocycle
  • Template synthesis

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