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Synthesis and Characterization of Salicylaldazine (H2L) and its mixed Ligand complexes [ML(H2O)],[M(LH)2(caf)n] ; M= Zn2+, Cd2+, Ni2+, Cu2+,Co2+, Mn2+, Fe2+; n=1,2 ; Caf= caffeine

Author Affiliations

  • 1Equipe métallation, complexes moléculaires et application, Faculté des sciences, BP 11201 Zitoune, Meknès, MOROCCO
  • 2 L.P.C.M., Faculty of Science and Technology, University Moulay Ismaïl, B. P. 509 Boutalamine, Errachidia, MOROCCO

Res.J.chem.sci., Volume 4, Issue (10), Pages 72-84, October,18 (2014)

Abstract

The ligand salicylaldazine (H2L) was prepared by condensation of salicylaldehyde and hydrazine in (2/1) molar ratio. The synthesized ligand was investigated using different physical techniques such as infrared, Raman spectroscopy, 1H, 13C NMR and UV-Visible. Transition metal complexes [ML(H2O)];M= Zn2+, Cd2+, Ni2+, Cu2+, Co2+, Mn2+, Fe2+ and the mixed ligand complexes [M(LH)2(caf)n]; M= Zn2+, Cd2+ for n=1 and M= Ni2+, Cu2+, Co2+, Mn2+,Fe2+ for n=2 derived from the ligand have been widely studied. The infrared, Raman and UV-Visible data of the metal complexes show that the ligand is coordinated to the metal ions in a tridentate manner, with NOO donor sites of the azine. It is also found that the geometrical structures of these complexes are tetrahedral. Based on the obtained infrared, Raman, NMR spectroscopy, UV-Visible and literature indications, the ligand is coordinated to the metal in bidentate manner through NO donor sites of the azine and with N9 imidazol of the caffeine. Thus, the mixed ligand complexes [M(LH)2(caf)n] exhibit a distorted pentahedral geometry for n=1; M=Zn2+, Cd2+ and a distorted octahedral geometry for n=2; M= Ni2+, Cu2+, Co2+, Mn2+ , Fe2+.

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