Article

Transition Metal Chemistry

, Volume 32, Issue 3, pp 344-349

Synthesis, characterization and redox properties of macrocyclic Schiff base by reaction of 2,6-diaminopyridine and 1,3-bis(2-carboxyaldehyde phenoxy)propane and its CuII, NiII, PbII, CoIII and LaIII complexes

  • Salih IlhanAffiliated withChemistry Department, Faculty of Education, Dicle University
  • , Hamdi TemelAffiliated withChemistry Department, Faculty of Education, Dicle University Email author 
  • , Ismail YilmazAffiliated withChemistry Department, Faculty of Arts and Sciences, Istanbul Technical University
  • , Ahmet KilicAffiliated withChemistry Department, Faculty of Arts and Sciences, Harran University

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Abstract

A new macrocyclic ligand, 1,3,5-triaza-2,4:7,8:,14,15-tribenzo-9,13-dioxacyclohexadeca-1,5-diene (L) was synthesized by reaction of 2,6-diaminopyridine and 1,3-bis(2-carboxyaldehyde phenoxy)propane. Then, its CuII, NiII, PbII, CoIII and LaIII complexes were synthesized by a template effect by reaction of 2,6-diaminopyridine and 1,3-bis (2-carboxyaldehyde phenoxy)propane and Cu\({(\hbox{NO}_{3})_{2} \cdot 3\hbox{H}_{2}}\)O, Ni\({(\hbox{NO}_{3})_{2} \cdot 6\hbox{H}_{2}}\)O, Co\({(\hbox{NO}_{3})_{2} \cdot 6\hbox{H}_{2}}\)O, La\({(\hbox{NO}_{3})_{3} \cdot 6\hbox{H}_{2}}\)O, respectively. The ligand and its metal complexes have been characterized by elemental analysis, IR, 1H- and 13C-NMR-, UV-vis spectra, magnetic susceptibility, conductivity measurements, mass spectra and cyclic voltammetry. All complexes are diamagnetic and the CuII complex is binuclear. The diamagnetic behaviour of the binuclear complex may be explained by a very strong anti-ferromagnetic interaction in the Cu–Cu pair. The CoII was oxidised to CoIII.