Nitrogen-14 Nuclear Magnetic Resonance Studies of Acetonitrile Exchange from the First Coordination Sphere of Manganese(II)

W. L. Purcell, R. S. Marianelli

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The 14N nuclear relaxation times of acetonitrile (CH3CN) solutions of manganese(II) perchlorate have been studied as a function of temperature. Saturation studies have shown that a scalar coupling mechanism controls the relaxation of the 14N nucleus in the coordination sphere of the Mn(II) ion. A determination of the kinetic parameters for the exchange of CH3CN from the first coordination sphere of Mn(II) yielded a first-order rate constant, k1, at 25° of (1.2 ± 0.3) × 107 sec-1, a ΔH for exchange of 7.25 ± 0.25 kcal/mol, and a ΔS for exchange of -1.8 ± 0.8 eu. The value determined for the scalar coupling constant, A/h, was 3.2 × 106 Hz.

Original languageEnglish (US)
Pages (from-to)1724-1728
Number of pages5
JournalInorganic Chemistry
Issue number7
StatePublished - Jul 1 1970


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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