A nitrogen-14 magnetic resonance study of the exchange of acetonitrile on cobalt(II) complexes

Abstract

A ¹⁴N N.M.R. study of the exchange of acetonitrile on high-spin Co(triol)(MeCN)₃²⁺ (kex = (23 ± 2) x 10⁴ s^-1 at 298 K; ΔH? = 40 ± 2 kJ mol^-1; ΔS? = -9.6 ± 6.2 J mol^-1 K^-1), high-spin Co(trenol)(MeCN)_~²⁺ (k_ex ≥ 2-x 10⁶ s^-l at 223 K), and low-spin Co(cyclam)(MeCN)_n²⁺ (where it is considered that n = 1 or 2 and k_ex ≥ 8 x 10⁶ s^-1 at 266 K) is reported, as are the magnetic moments and visible spectra of these complex ions.