AN ELECTRON PARAMAGNETIC RESONANCE STUDY OF MN(2)-CHLORO COMPLEX FORMATION IN N,N-DIMETHYLFORMAMIDE

EPR spectra differing in hyperfine splitting have been reported for Mn(II) ions in N,N-Dimethylformamide (DMF) when using Mn(ClO4)2 and MnCl2. The difference in the reported spectra is shown to be due to the species MnCl42⊖ by a mole ratio plot. The presence of MnCl⊕ is also indicated by a mole ratio plot. Three basic spectra, differing in hyperfine splitting, are obtained for solutions of Mn (ClO4)2 in DMF to which varying amounts of chloride ion have been added. ΔH0 for the equilibrium reaction of the species Mn2⊕ und MnCl⊕ was determined from the variation of the formation constant, Kc, with temperature over the range 25° to 116 °C. Values for ΔF0 and ΔS0 at 25 °C are also given. © 1969, Walter de Gruyter. All rights reserved.