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Nuclear Resonance Studies of Structural Equilibria in Solutions of Nickel(II) Complexes

  • R. H. Holm
  • A. Chakravorty
  • G. W. EverettJr.
Conference paper

Abstract

Recent work (1–7) has demonstrated that in solutions of non-coordinating solvents certain general types of four-coordinate nickel(II) complexes undergo a rapid dynamic structural equilibrium between planar and tetrahedral confi — gurations. This existence of this equilibrium has already been demonstrated in the cases of bis(N, N-disubstituted-aminotroponeimine) (5), bis(N-substituted-salicylaldimine) (1, 2, 6), and bis(N-substituted-o-hydroxynaphthal - dimine) (3, 7) complexes. For these general types of complexes it has been shown (2 – 5) that an analysis of the isotropic proton hyperfine contact shifts (8) manifested in the nuclear magnetic resonance spectra leads to an evaluation of the thermodynamic parameters (ΔF, ΔH, ΔS) of the structural change, and to a determination of the spin density distribution in the π-system of the coordinated ligand.

Keywords

Nuclear Magnetic Resonance Spectrum Spin Density Spin Density Distribution Molybdic Acid Hydrochloric Acid Medium 
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References

  1. 1.
    HOLM, R. H., and SWAMINATHAN, K., Inorg. Chem.,2, 181 (1963).CrossRefGoogle Scholar
  2. 2.
    HOLM, R. H., CHAKRAVORTY, A., DUDEK, G. O., J. Am. Chem. Soc., 86, 387 (1964).Google Scholar
  3. 3.
    CHAKRAVORTY, A., and HOLM, R. H., Inorg. Chem., in press.Google Scholar
  4. 4.
    EVERETT, G. W., Jr., and HOLM, R. H., J. Am. Chem. Soc., 86, in press.Google Scholar
  5. 5.
    EATON, D. R., PHILLIPS, W. D., CALDWELL, D. J., J. Am. Chem. Soc., 85, 397 (1963).CrossRefGoogle Scholar
  6. 6.
    SACCONI, L., PAOLETTI, P., and CIAMPOLINI, M., J. Am. Chem. Soc., 85, 411(1963).CrossRefGoogle Scholar
  7. 7.
    SACCONI, L., CIAMPOLINI, M., and NARDI, N., J. Am. Chem.Soc., 86, 819 (1964).CrossRefGoogle Scholar
  8. 8.
    EATON, D. R., JOSEY, A. D., PHILLIPS, W. D., and BENSON, R. E., J. Chem. Phys., 32, 347 (1962).CrossRefGoogle Scholar
  9. 9.
    HSEU, T.M., MARTIN, D. F., MOELLER, T., Inorg. Chem., 2, 587 (1963).CrossRefGoogle Scholar
  10. 10.
    LIN, W. C., and ORGEL, L. E., Mol. Phys., 7, 131 (1963).CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Wien 1964

Authors and Affiliations

  • R. H. Holm
    • 1
  • A. Chakravorty
    • 1
  • G. W. EverettJr.
    • 1
  1. 1.Department of ChemistryHarvard UniversityCambridgeUSA

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