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NMR study of the stoichiometry and stability of complexation reaction between Mg2+, Ca2+, Sr2+ and Ba2+ ions and 60-crown-20 in binary acetonitrile solvent mixtures

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Abstract

Proton nuclear magnetic resonance (1H-NMR) spectroscopy was used to study the complexation reaction between Mg2+, Ca2+, Sr2+ and Ba2+ ions and 60-crown-20 in a series of binary mixtures of deuterated acetonitrile (AN), nitromethane (NM) and D2O at 27 °C. Formation constants of the 1:1 complexes were determined through computer fitting of the chemical shift/mol ratio data and found to vary in the order of Ba2+ > Sr2+ > Mg2+ ≈ Ca2+. The influence of the solvent composition on the stability of the resulting complexes was also discussed. In all cases, the changes in the stability constants with the solvent composition were monotonic and showed a good correlation with the inherent solvation ability of the pure solvents which form the mixture.

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Authors and Affiliations

  1. Department of Chemistry, Imam Hossein University, Tehran, Iran

    M. Rahimi-Nasrabadi & A. Moghimi

  2. Islamic Azad University, Varamin-Pishva Branch, Varamin, Iran

    S. Pourmohamadian

  3. Faculty of Material and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran

    S. M. Pourmortazavi

  4. Department of Medicinal Chemistry, Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Iran

    F. Ahmadi

  5. Faculty of Chemistry, Tehran University, Tehran, Iran

    M. R. Ganjali

Authors
  1. M. Rahimi-Nasrabadi
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  2. S. Pourmohamadian
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  3. S. M. Pourmortazavi
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  4. F. Ahmadi
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  5. M. R. Ganjali
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  6. A. Moghimi
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Corresponding authors

Correspondence to M. Rahimi-Nasrabadi or F. Ahmadi.

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Rahimi-Nasrabadi, M., Pourmohamadian, S., Pourmortazavi, S.M. et al. NMR study of the stoichiometry and stability of complexation reaction between Mg2+, Ca2+, Sr2+ and Ba2+ ions and 60-crown-20 in binary acetonitrile solvent mixtures. J Incl Phenom Macrocycl Chem 73, 263–267 (2012). https://doi.org/10.1007/s10847-011-0051-2

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  • DOI: https://doi.org/10.1007/s10847-011-0051-2

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