Add time:09/01/2019         Source:sciencedirect.com

ESR spectra at both X- and Q-band are reported for Mn(II) ions doped at a nominal 1% in the lattices of [M(DA)2(H2O)2]X2 (M = Mg, Co and Ni; X = Cl or Br), [Mg(DA)2(H2O)2](NO3)2, [Co(DA)4(H2O)2]Br2, M(DA)2Cl2 (M = Mg, Co and Ni) and M(DA)2(NO3)2 (M = Co and Zn). The zero-field splitting parameters D and λ (= E/D) are deduced. The observed values of D and λ for all the hydrated complexes are consistent with an MO62+ chromophore, suggesting the coordination of water molecules. Higher values of D are observed for M(DA)2Cl2 (M = Mg, Co and Ni) than for the hydrated analogues. The positive sign of D, deduced for the first time from the hyperfine spacing at Q-band, suggests the trans-coordination of chloride ions and very high λ values indicate considerable inplane distortion.

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