Zero-field splitting of manganese(II) ions in polymeric MN2X4(M = Cd or Zn, X = halogen) co-ordination

Abstract

E.s.r. spectra at X and Q band are reported for manganese(II) ions doped into the halide-bridged polymers Cd(py)₂X₂(X = Cl or Br), Cd(4Me-py)₂Cl₂, Cd(pyz)X₂(X = Cl, Br, or I), and Zn(pyz)Cl₂·0.5H₂O (py = pyridine, 4Me-py = 4-methylpyridine, pyz = pyrazine). Zero-field splitting parameters _D and λ(=E/D) are obtained. For all the complexes λ is close to zero, while D is in the range 0.11–0.14 cm ^–1for the chlorides, and ca. 0.3 cm^–1 for the bromides. The distortion from octahedral geometry is therefore less than in related MnN₄X₂ complexes.