Vanadium (IV and V) complexes of reduced Schiff bases derived from the reaction of aromatic o-hydroxyaldehydes and diamines containing carboxyl groups

João Costa Pessoa, Susana Marcão, Isabel Correia, Gisela Gonçalves, Agnes Dörnyei, Tamás Kiss, Tamás Jakusch, Isabel Tomaz, M. Margarida C.A. Castro, Carlos F.G.C. Geraldes, Fernando Avecilla

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Abstract

The reduced Schiff bases of salicylaldehyde [and o-vanillin (o-van)] with D,L- and L-diaminopropionic acid (DPA), designated by salDPA, and L-2,4-diaminopentanoic acid [ornithine (Orn)], designated by salOrn, as well as the VIVO2+ and VVO2+ complexes of salDPA were prepared. The compounds were characterised in the solid state and in solution. The structure of H4salDPA+Cl - was determined by X-ray diffraction. Complexation of V IVO2+ and VVO2+ with salDPA and salOrn (only the VIVO system) in aqueous solution was studied by potentiometry, UV/Visible spectroscopy and circular dichroism, as well as by EPR spectroscopy for the VIVO-salDPA system and by 1H- and 51V NMR spectroscopy for the VVO 2-salDPA system. Stoichiometries and complex formation constants were determined by potentiometry at 25°C and I = 0.2 M KCl. Practically only 1:1 complexes were formed in both systems with composition (VO)LH2 and (VO)L in the VIVO-salDPA system, and with composition (VO 2)LH and (VO2)L in the VVO2-salDPA system. Spectroscopic data provided information about the most probable binding modes of each stoichiometry.

Original languageEnglish
Pages (from-to)3595-3606
Number of pages12
JournalEuropean Journal of Inorganic Chemistry
Issue number18
DOIs
Publication statusPublished - Sep 18 2006

Keywords

  • Coordination modes
  • Equilibrium and structural studies
  • N,O ligands
  • Salen-like ligands
  • Vanadium

ASJC Scopus subject areas

  • Inorganic Chemistry

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    Pessoa, J. C., Marcão, S., Correia, I., Gonçalves, G., Dörnyei, A., Kiss, T., Jakusch, T., Tomaz, I., Castro, M. M. C. A., Geraldes, C. F. G. C., & Avecilla, F. (2006). Vanadium (IV and V) complexes of reduced Schiff bases derived from the reaction of aromatic o-hydroxyaldehydes and diamines containing carboxyl groups. European Journal of Inorganic Chemistry, (18), 3595-3606. https://doi.org/10.1002/ejic.200600309