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Complexation studies of Mn2+, Zn2+ and Cd2+ ions with a series of tetradentate (N4) Schiff base ligands containing pyridine moiety in acetonitrile and nitromethane solutions by a competitive NMR technique using 7Li nucleus as a probe

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Abstract

Lithium-7 NMR spectroscopy was used to investigate the stoichiometry and stability of a Li+ complex with N1,N2-bis(pyridin-2-ylmethylene)ethane-1,2-diamine (L1), N1,N3-bis(pyridin-2-ylmethylene)propane-1,3-diamine (L2) and N1,N4-bis(pyridin-2-ylmethylene) butane-1,4-diamine (L3) in acetonitrile (AN) and nitromethane (NM) solutions. A competitive 7Li NMR method was also employed to probe the complexation of Mn2+, Cd2+ and Zn2+ ions with L1, L2 and L3 in the same solvents. The formation constants of the resulting complexes were evaluated from computer fitting of the mole ratio data to an equation that relates the observed chemical shifts to the formation constant. In both solvents, the stability of the resulting 1:1 complexes were found to vary in the order Zn2+>Cd2+>Mn2+>Li+. In addition, the stability of M–L complexes of M2+ with the Schiff base ligands found to vary in the order M2+–L1 > M2+–L2 > M2+–L3.

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Acknowledgments

The financial support Faculty of Research Council of Bu-Ali Sina University gratefully acknowledged.

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Authors and Affiliations

  1. Faculty of Chemistry, Bu-Ali Sina University, 65174, Hamedan, Iran

    Hassan Keypour, Mohammad Hassan Zebarjadian & Seyyed Javad Sabounchei

  2. Department of Chemical Engineering, Hamedan University of Technology, 65155, Hamedan, Iran

    Majid Rezaeivala

  3. Department of Chemistry, Razi University, Kermanshah, Iran

    Mojtaba Shamsipur

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  1. Hassan Keypour
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  2. Mohammad Hassan Zebarjadian
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  3. Majid Rezaeivala
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  4. Mojtaba Shamsipur
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  5. Seyyed Javad Sabounchei
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Correspondence to Hassan Keypour.

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Keypour, H., Zebarjadian, M.H., Rezaeivala, M. et al. Complexation studies of Mn2+, Zn2+ and Cd2+ ions with a series of tetradentate (N4) Schiff base ligands containing pyridine moiety in acetonitrile and nitromethane solutions by a competitive NMR technique using 7Li nucleus as a probe. J IRAN CHEM SOC 10, 1137–1143 (2013). https://doi.org/10.1007/s13738-013-0248-y

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